The Best Apps to Track Your Water Intake
App guide
Ranked & compared
WaterMinder and Waterllama are the best dedicated hydration apps; WaterMinder wins on cross-device Apple Watch support; Waterllama wins on iOS design; MyFitnessPal and Yazio are sufficient if you already log food there.
Staying hydrated matters for everyone, but it becomes a specific clinical concern on GLP-1 medications like semaglutide and tirzepatide, where nausea and reduced thirst cues make dehydration common. Dedicated hydration apps add the reminders and goal-setting that general food trackers lack. We evaluated the top options based on ease of logging, reminder quality, goal personalization, and platform availability to find the best fit for GLP-1 users who need to hit a higher fluid target.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Hydration tracking matters year-round but becomes a specific clinical concern on GLP-1 drugs, where nausea and reduced thirst cues make dehydration easy. Clinical guidance for GLP-1 users points to more than 2 to 3 liters of fluid per day to prevent constipation, kidney stress from rapid fat metabolism, and electrolyte depletion from GI side effects. Dedicated hydration apps add reminders and goal-setting that general food apps lack.
How we evaluated them
Evaluated on: ease of logging (one-tap or wrist-based); beverage type diversity; reminder system quality; goal personalization (weight- and weather-adjusted); platform availability; price transparency; and relevance to GLP-1 hydration management.
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
WaterMinder
Free / Premium $2.99/mo, $9.99–$29.99/yr, or $49.99 lifetimeiOS / Android / Mac / Apple WatchBest for: Cross-device hydration tracking with strong Apple Watch support
- One-tap wrist logging
- Weight- and weather-adjusted goals
- Custom containers
- Free tier limited
- Subscription required for full features
Waterllama
Free / premium about $9.99/yr (lifetime option)iOSBest for: Playful, design-forward hydration on iOS
- 40+ beverage types with hydration credit
- Apple Watch support
- Charming gamified characters
- iOS only
MyFitnessPal
Free / Premium $19.99/mo or $79.99/yriOS / Android / WebBest for: Water logging inside your food diary
- Water tracked in the same app as nutrition
- Basic vs. dedicated hydration apps
Yazio
Free / Pro $6.99/mo or $47.90/yriOS / AndroidBest for: Water tracking with reminders and fasting integration
- Built-in water tracker with reminders
- Some features gated behind Pro
Why Hydration Tracking Is Non-Negotiable on GLP-1 Medications
GLP-1 receptor agonists like semaglutide and tirzepatide don't just suppress appetite—they blunt thirst cues, too. The same brain regions that regulate hunger also influence the drive to drink, and when those signals go quiet, dehydration can set in before you ever feel thirsty.
The problem compounds quickly. Nausea, vomiting, and diarrhea—common side effects in the first weeks of treatment—actively deplete fluids. Reduced food intake also means you're getting less water from food, which typically accounts for about 20% of total fluid intake. Clinical guidance for GLP-1 users consistently points to more than 2 to 3 liters of fluid per day, a target that's harder to hit than it looks when drinking makes nausea worse.
Dehydration on GLP-1s isn't just uncomfortable—it creates a cascade of secondary problems. Constipation, already a frequent side effect of slowed gastric emptying, worsens significantly without adequate water. Rapid fat metabolism places additional stress on the kidneys, which need sufficient fluid to process metabolic byproducts. And electrolyte imbalances from GI losses can amplify fatigue and muscle cramps, making it harder to stay active and maintain muscle mass during weight loss.
Bottom line
GLP-1 nausea suppresses both hunger and thirst simultaneously—dehydration is common in the first weeks, and the more than 2 to 3 liters per day fluid target is harder to hit than it looks when drinking makes nausea worse.
The 4 Best Apps for Tracking Water Intake
After testing the major hydration apps against the specific needs of GLP-1 users—low-friction logging, smart reminders, and personalized goals—four stood out. WaterMinder is the best overall choice, especially if you have an Apple Watch. Waterllama is the most enjoyable to use on iOS. MyFitnessPal and Yazio are solid options if you're already logging food and want to keep everything in one place.
WaterMinder's killer feature is one-tap logging from the Apple Watch. When you're already struggling with nausea, the last thing you want to do is unlock your phone, open an app, and manually enter ounces. A quick tap on the wrist removes that friction entirely. The app also adjusts your daily goal based on body weight and local weather—a heavier person in a hot climate gets a higher target than a lighter person in a cool one, which is more honest than a flat 64-ounce default.
Waterllama takes a different approach: it makes hydration fun. The app features charming illustrated characters that react to your logging, and it supports more than 40 beverage types with appropriate hydration credit. Coffee counts at roughly 80%, tea at about 90%, and juice near 90%. If you're someone who finds plain water unappealing—especially when nauseated—Waterllama's beverage variety gives a more accurate picture of total fluid intake than a pure water log. The downside is iOS exclusivity.
MyFitnessPal and Yazio are the practical picks for people who already live in a food-tracking app. Both include water logging on their free tiers, with reminder functionality. They won't match the depth of a dedicated hydration app, but they eliminate the need to juggle two separate tools. Yazio's integration with intermittent fasting is a bonus if you're combining GLP-1 therapy with time-restricted eating.
Bottom line
WaterMinder is the best choice if you have an Apple Watch—one-tap logging from the wrist is the lowest-friction option for someone who already doesn't want to drink.
How Much Water Do You Actually Need on GLP-1 Drugs?
The clinical guidance citing more than 2 to 3 liters of fluid per day for GLP-1 users is a pragmatic minimum, not a precise prescription. It's based on the observation that standard Adequate Intake recommendations—3.7 liters for men and 2.7 liters for women from all sources, per the National Academies—are already a stretch for many people, and GLP-1 side effects push intake even lower.
Several factors shift your individual target upward. Body weight is the most significant: larger individuals have higher absolute fluid needs. Exercise adds to the deficit through sweat losses. Hot or dry climates increase insensible water loss through skin and respiration. And if you're experiencing active GI side effects like diarrhea or vomiting, replacement needs can spike dramatically.
The practical takeaway is to set your app's goal based on body weight—WaterMinder does this automatically—and then adjust upward if you're in a hot climate, exercising regularly, or dealing with GI losses. Coffee and tea absolutely count toward your total. The old idea that caffeine is a net dehydrator has been thoroughly debunked; caffeinated beverages contribute to hydration, just at a slightly lower efficiency than plain water.
Bottom line
The clinical guidance citing more than 2 to 3 liters of fluid per day for GLP-1 users is a pragmatic minimum, not a precise prescription—heavier individuals, those in hot climates, or those who exercise need more; adjust your app's goal accordingly.
Counting Every Drink: Beverages Beyond Plain Water
Plain water is the gold standard, but it's not the only thing that hydrates you. Waterllama's 40-plus beverage types reflect a more nuanced reality: coffee provides roughly 80% of the hydration of an equivalent volume of water, tea about 90%, and juice near 90%. Milk and milk alternatives are excellent hydrators, often outperforming water due to their electrolyte and macronutrient content.
This matters for GLP-1 users because plain water can be actively unappealing during periods of nausea. Cold, carbonated water often goes down more easily than still. Herbal teas, particularly ginger or peppermint, can simultaneously hydrate and soothe GI discomfort. Electrolyte drinks—whether commercial or homemade—serve a dual purpose by replacing sodium and potassium lost through reduced food intake and GI side effects.
When logging in an app that supports beverage types, be honest about what you're drinking. A 12-ounce latte isn't 12 ounces of water—it's closer to 10 ounces of hydration credit. An electrolyte drink with significant sodium content is hydrating but should be logged separately from plain water so you can track your total sodium intake alongside your fluid intake. Apps that let you differentiate by beverage type give a more accurate picture than a simple ounce counter.
Bottom line
Coffee, tea, and other beverages count toward hydration—apps that let you log by beverage type, like Waterllama and WaterMinder, give a more accurate picture than pure water logs.
Connecting Hydration to Fiber and Electrolyte Tracking
Water doesn't work in isolation. The two most important connections for GLP-1 users are fiber and electrolytes. Fiber needs water to form soft, bulky stool—without adequate fluid, a high-fiber diet can actually worsen constipation rather than relieve it. The evidence-based starting protocol for GLP-1 GI management pairs 14 grams of fiber per 1,000 calories with more than 2 liters of water per day.
Electrolytes are the other half of the hydration equation. GLP-1 medications reduce food intake, which means you're getting less sodium, potassium, and magnesium from your diet. GI side effects further deplete these minerals. Drinking large volumes of plain water without adequate electrolyte intake can, in rare cases, dilute serum sodium levels—a condition called hyponatremia that causes fatigue, headache, and confusion.
The practical solution is to use your hydration app's data alongside a broader nutrition tracker. If you're logging water in WaterMinder and food in Cronometer, you can cross-reference your fluid intake against your fiber and sodium numbers. If you're using MyFitnessPal or Yazio, everything is in one place. The goal isn't to obsess over every ounce but to spot patterns: if your fiber is high and your water is low, constipation is predictable. If your water is high and your sodium is low, adding an electrolyte source is worth considering.
Bottom line
Hitting your fiber target without adequate water can worsen constipation rather than relieve it—the combination of 14 grams of fiber per 1,000 calories plus more than 2 liters of water per day is the evidence-based starting protocol for GLP-1 GI management.
What most pages leave out
The commonly cited '8×8' rule (eight 8-ounce glasses) is not based on rigorous clinical evidence for all individuals. The National Academies' Adequate Intake is higher—3.7 liters for men and 2.7 liters for women from all sources—and accounts for food-sourced water. Hydration apps with one flat-goal default can be misleading for different body sizes or climates. Weight-adjusted goals, like those in WaterMinder, are more honest than a single universal number.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
Clinical guidance points to more than 2 to 3 liters of fluid per day. Adjust upward for body size, climate, and activity level. Set a personalized goal in your tracking app rather than using the default, and remember that all beverages—not just plain water—count toward your total.
MyFitnessPal and Yazio both track water on their free tiers. For a dedicated hydration app, WaterMinder has a free tier with limited features, and Waterllama has a free option on iOS. The free versions are sufficient for basic logging, though premium features like detailed history and advanced reminders require payment.
Yes. WaterMinder's Apple Watch app allows one-tap logging directly from the wrist, with complications that display your progress on your watch face. It also supports Mac and iPad, making it the most cross-device option available.
Yes. Both count toward hydration—coffee at roughly 80% credit and tea at about 90%. Apps like Waterllama let you log by beverage type and apply the correct hydration credit automatically. The old belief that caffeine dehydrates you has been debunked by modern research.
Yes. Water works synergistically with dietary fiber to soften stool and promote regular bowel movements. Hitting more than 2 liters per day alongside 14 grams of fiber per 1,000 calories is the first-line dietary approach before considering laxatives. Without adequate water, fiber can actually worsen constipation.
No. Waterllama is iOS only. WaterMinder and Yazio are both available on Android as cross-platform alternatives with comparable feature sets.
GLP-1 receptors are present in brain regions that regulate both appetite and thirst. The medication's appetite-suppression mechanism also blunts thirst signals. This is why scheduled drinking—not thirst-based drinking—is recommended. Set reminders in your hydration app and sip throughout the day rather than waiting until you feel thirsty.
Yes. Dehydration and GI side effects can create a self-reinforcing cycle: nausea reduces your desire to drink, and dehydration worsens nausea. Small, frequent sips of cold water or sparkling water are a common clinical recommendation. If you can't consistently hit 1.5 liters per day, flag it to your prescriber.
Related Articles
The Best Apps to Track Your Sodium Intake
We tested the top apps for tracking sodium intake. Cronometer is best for precision and potassium ratio, while Fooducate excels at scanning packaged foods.
Read moreTop Apps to Track Sugar Intake
We tested the best apps to track total and added sugar. Cronometer separates added sugar on its free tier; MyFitnessPal and Fooducate have key limits.
Read moreWhat Are the Best Apps to Track Cholesterol Intake?
We tested the top apps for tracking dietary cholesterol and saturated fat. See why Cronometer's lab-verified data beats crowd-sourced databases for accuracy.
Read moreTop Apps to Track Micronutrient Intake
Cronometer tracks 80+ vitamins and minerals for free—far more than MyFitnessPal or MacroFactor. See which micronutrient tracker fits your needs, especially on GLP-1s.
Read moreTop Apps to Track Fiber Intake
We tested the best apps for tracking fiber. Cronometer is the most accurate free option. See how MyFitnessPal, MacroFactor, and Yazio compare for GLP-1 users.
Read moreTop Apps to Track Daily Calorie Intake
We compare MyFitnessPal, MacroFactor, Lose It! and Cronometer for GLP-1 users. Learn which app best prevents under-eating and adapts to rapid weight loss.
Read moreOn a GLP-1, or thinking about one?
Eating well is the foundation. For some people, a GLP-1 medication is the tool that finally makes appetite manageable.Curex connects you with licensed clinicians for compounded GLP-1 medications, if it's right for you.
- Compounded semaglutide from $49/mo, tirzepatide from $149/mo
- Prescribed by licensed clinicians after an online visit
- Delivered to your door — no in-person clinic required
This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.