Start without registering
You do not need to register to track your water.
You control Apple Health permissions
Choose your Health permissions. Entries in Apple Health and any synchronisation across Apple devices also depend on your Apple settings.

Weather needs a connection
The app requests weather from Apple WeatherKit. Coordinates rounded to two decimal places are sent for that request; health data is not included. You need an internet connection for current weather data.
What you can use offline
You can use locally available data without a continuously active internet connection. New weather information and updates between devices may need connectivity.