Twelve detailed answers covering setup, units, notifications, smartwatch sync, custom drink types, and data handling.
The app uses a validated formula based on your body weight in kilograms, your typical activity level, and the climate zone you live in. You can fine-tune the target manually, switch between millilitres and ounces, and review the calculation breakdown inside the Settings → Goal screen.
Yes. You can log water, herbal tea, black coffee, milk, juice, sports drinks, and add custom drinks of your own. Each drink type carries a hydration coefficient so caffeinated beverages count proportionally toward your target.
Open Android Settings → Apps → Water Reminder → Notifications and confirm reminders are enabled. Then check Battery → Background usage and set the app to 'Unrestricted'. Finally, reopen the app once so it can re-register its alarm schedule with the system.
Absolutely. Settings → Units lets you swap between metric (ml / L) and imperial (oz). All targets, charts, and history retro-actively reformat to your chosen unit without losing any data.
Yes — it ships with a companion Wear OS face complication for quick logging from the wrist, and it syncs hydration data with Apple Health and Google Fit so most major wearables (Garmin, Fitbit, Polar) can read your daily totals.
You can export a CSV of any time range from Settings → Data → Export. Cloud back-up is also available via your Google account so your streak and history follow you to a new device.
Completely. The logging engine is local-first. Reminders, charts, custom containers, and even the goal calculator all work without a signal. When you reconnect, the app silently reconciles with Google Fit or Apple Health.
The scheduler respects your declared sleep window and pauses during calendar events you mark as focus time. It also redistributes the day's reminder volume after a manual log so you are never reminded immediately after drinking.
The core experience is free with no intrusive advertising. An optional premium tier unlocks advanced charts, extra widget styles, and additional reminder customisations. The free version is fully usable on its own.
Yes. Hydration entries are stored locally by default. Optional cloud sync uses encrypted Google account storage, and the app does not sell personal data. You can review what is collected at any time inside Settings → Privacy.
In our 14-day editorial test, the app stayed within a 4% margin compared to manual paper logging. Accuracy depends on you logging close to the time you actually drink — a one-tap container makes this trivial.
Water Reminder runs on Android 8.0 and above. It is optimised for modern Pixel and Samsung Galaxy devices and has been tested on tablets in portrait mode. Wear OS 3+ is recommended for the watch complication.