Hot days and workouts raise today's goal
An hour of exercise in the heat can cost between half a litre and two litres of sweat, so a fixed daily goal is wrong on exactly the days it matters most.
Tell Sippy about the day
- On the Today screen, tap “Hot day” if it is unusually hot where you are. It adds 500 ml to today's goal.
- Tap “Workout” and give the number of minutes you trained. Sippy adds about 250 ml for every half hour, rounded to 50 ml, up to a litre.
- Both are for today only. Tomorrow starts from your usual goal again.
Why the cap
Heat and exercise are the same sweat counted twice, so together they add at most 1 L however you combine them. Real sweat rates vary enormously (ACSM, 2007), and Sippy deliberately stays on the low side: thirst is a better guide than an app for the rest.
It also changes the Lock Screen
If you have turned on “Progress on the Lock Screen”, tapping Hot day or logging a workout starts a Live Activity: today's progress on the Lock Screen and in the Dynamic Island for up to six hours, and it disappears as soon as you reach the goal.
FAQ
- Does a hot day change my goal permanently?
- No. It applies to that day only. If you live somewhere hot all year, turn on “I live in a hot climate” in Settings instead — that one adds 300 ml to the suggestion every day.
- Does Apple Health import my workouts automatically?
- No. Sippy reads and writes water only; the workout minutes are something you tell it, which keeps its access to Health as narrow as possible.
- What if I forget to tap Hot day until the evening?
- Add it whenever — the goal changes for the whole day, and today's drinks are re-measured against it.
Sippy is a reminder and a record of what you drink, not medical advice. Its suggested goal follows published guidance for healthy adults, and the app is for ages 14 and up. If you have heart, kidney or liver disease, low blood sodium, take diuretics, or have been told to limit fluids, ask your doctor before setting a goal.
Drink water, grow cute cats
Sippy nudges you only when you are behind, logs a glass in one tap from the Lock Screen, and grows a cat farm — or a tiny forest — as the goal days add up. Free, no ads, and nothing leaves your iPhone.
Download on the App Store