On first launch, Fillwell asks for your body weight, activity level and climate, then calculates a daily fluid target and a mineral (sodium/potassium/magnesium) target. You can redo this calculation any time from Settings > Recalculate Goal.
Tap the bottle on the home screen to log a fill or a sip — choose Water, Electrolyte Drink or Mineral Water so the right amount is added to both your fluid level and your mineral balance. The bottle visualization fills toward your daily target.
The three small bars under the bottle show sodium, potassium and magnesium progress toward your daily target. Electrolyte and mineral water contribute more to these bars than plain water does.
Set your reminder interval in Settings. Reminders need notification permission; if you declined it, enable notifications for Fillwell in the iOS Settings app.
A day counts toward your streak when you reach your fluid target. Open Insights for the weekly fluid chart and the mineral breakdown chart.
Add the Fillwell widget from your home screen's widget gallery to see today's bottle level without opening the app.
No. There is no account and nothing is uploaded. Your log lives on this device only, so deleting the app deletes the log.
The ad-free unlock is a one-time purchase tied to your Apple ID. On a new device, open Premium and tap Restore Purchases.