Water Reminder App with Friends
Add your partner, your roommates, or your whole group chat with a share link. When friends haven’t peed in a while, send a water reminder with one tap. They feel thought-of, you have fun sending it. Add two friends who use the app, too, and unlock extra features for free.
Last updated: May 2026
What Users Say About P’s Friends Feature
These are real users’ descriptions of their own experiences.
I’ve sold everyone I know on this app. I wish you could tell it it’s okay you just have a super large bladder. It lets you tell your friends to drink water!
App is super easy to use, seamless friend invites, and cool features! Very helpful to make sure I am drinking enough water
Genuinely a helpful app, it’s been the one thing keeping me up to date with my hydration, and it’s also funny to follow your friends haha!
ngl, this app is so useful. i’ve been using it for a couple of days now and i got my friends to join me and we all got a free subscription (if you add 2 friends you all get free sub). i’ve been using the free version before and it’s also great 👯♂️
Drink Water With Friends, Not Just by Yourself
Drinking enough water is one of those habits that’s easy to forget alone and easier to remember when your people are doing it with you. P works like a water tracker with friends, except you don’t have to log every glass. P measures hydration through how often you pee, so all you do is tap when you’re on your way to the bathroom. Your friends see how long it’s been since you last logged a pee. If it’s been a while, that’s the moment to send a water reminder.
It’s a much lower-friction way to share hydration with friends than logging every drink. There’s nothing to fudge and nothing to forget. The signal is honest, and the reminder is one tap.
How Friends Work in P
P’s Friends feature is built into the iPhone app. The core mechanic: when friends haven’t peed in a while, that’s the moment they could use some water. P surfaces that signal, and you can send a reminder with one tap. The recipient gets it as a push notification on their phone, plus their Apple Watch if they wear one.
1. Send an invite link
Tap Add Friend, share the link via Messages, WhatsApp, or anywhere else. The recipient opens the link, P accepts the share, and the two of you become mutual friends.
2. See who could use water
Open the Friends tab and you can tell at a glance who hasn’t logged in a while. The longer it’s been, the better the time to send a reminder.
3. Send a water reminder
One tap and a push notification lands on the friend’s phone or Apple Watch. It’s a small “thinking of you” moment that just happens to be useful, and it’s fun in both directions.
Why People Use This With Their Crew
The reminders are the heart of the feature. Receiving one feels good: someone you care about was thinking of you and took two seconds to nudge you toward water. Sending one feels good too. It’s a low-effort way to say “I’m thinking of you” without having to type anything.
It works for any group close enough to text each other: partners, families, roommates, friend groups, coworkers. The shared thread is the same simple loop. One tap sends a friend a drink-water reminder, no typing required. Long-term streaks are visible too, but the day-to-day fun is the water reminder itself. For users who want even more visibility into a specific friend, P added TMI Mode by popular demand: turn it on for a friend and you get a notification every time that friend logs a pee.
Get P and Add Your First Friend
Free on iPhone and Apple Watch. Send a share link to the people you want to track with, and a water reminder when one of them hasn’t peed in a while. With two friends on board, extra features unlock for free.
Frequently Asked Questions
Yes. P has a built-in Friends feature on iPhone. Tap Add Friend, send the share link via Messages or any other app, and the recipient accepts the link to become a mutual friend. From there you can see who hasn’t peed in a while and send a water reminder with one tap. Recipients get the reminder as a push notification on their phone (and on their Apple Watch if they wear one).
Open the Friends tab in P on iPhone. Once it’s been over 4 hours since a friend last peed, a water reminder button appears next to that friend. Tap it, and a push notification lands on the friend’s phone (and on their Apple Watch if they wear one). Friends who have gone 24+ hours without logging drop into a separate doghouse section, which is the place to rally someone who’s fallen off the habit entirely.
Yes. Adding friends, seeing each other’s hydration, and sending and receiving water reminders is all free. P has extra features too (Stealth Mode that hides “pee” throughout the app, full calendar history, notes on each log, reminder customization, custom app icons, and CSV export). Subscribe to unlock them, or add two friends who use the app and unlock them all for free.
Yes. Many P users add a partner, a roommate, or a family member so the two of them can nudge each other on busy days. The feature works for any group: couples tracking together, parents and adult kids, friend groups, or coworkers on the same shift. Add two friends who use the app, and the extra features unlock for free.
Not directly, because P doesn’t track water intake. P measures hydration through how often you pee instead. What friends see is how long it’s been since you last logged a pee, which is the signal P uses to decide whether you’re due for a drink. It’s an honest hydration signal that doesn’t require you to log every glass.
P doesn’t have a formal leaderboard or competitive challenge system. What it does have: visible streaks for each friend, the doghouse for friends who haven’t logged in 24+ hours, and one-tap water reminders. Most groups end up in a friendly back-and-forth of reminders and streak comparisons rather than a points race.
P serves as one. Add a hydration buddy by share link, and you can both see when the other hasn’t peed in a while and send a quick drink-water reminder. It works for a single buddy, a partner, a roommate, or a whole group chat. Add two who use the app and unlock extra features for free.
Friends see how long it’s been since you last logged a pee. That’s the signal they use to decide whether to send a reminder. They can also see your current streak. They don’t see locations, notes you’ve added to logs, or any deeper history. Quiet Hours let you set time windows when you don’t want to receive reminders. Everything is opt-in: you choose who to add as a friend.
Receiving reminders does. When a friend sends you a water reminder, the push notification appears on your Apple Watch the same way other iPhone notifications do. Managing friends and sending reminders is currently in the iPhone app, not the Watch app.
Most water tracker apps require you to log every drink manually. P logs your hydration through pee frequency instead, which means one tap on your way to the bathroom and you’re done. That low-friction logging is what makes the Friends feature actually fun: friends see real activity instead of someone forgetting to log a morning coffee. See the full comparison with WaterMinder, WaterLlama, Plant Nanny, and Hydro Coach.
P is a general wellness tracker, not a medical device. Hydration needs vary by individual; talk to a healthcare professional about your specific situation.