8 cups
Water baseline
Use cups as the simple US default, then adjust for heat, workouts, and body size.
Water tracker
Hydration is the quiet fasting advantage.
The fasting product should make water, caffeine, and electrolytes visible without turning the day into medical homework.
Earlier is easier
Caffeine context
Coffee can help mornings, but late caffeine can make hunger and sleep worse.
Zero sugar
Electrolytes
Salt, magnesium, and potassium can help longer fasts without turning the fast into a snack.
Gentle finish
Evening rhythm
Do not chase all water at night. The best tracker prevents sleep disruption too.
Daily shape
A simple cup rhythm beats a perfect spreadsheet.
1
Wake
2
Coffee
3
Lunch
4
Dinner