H₂O Timer

How it works

H₂O Timer duration and amount picker on Apple Watch, showing 5 minutes and a 250.5 mL amount set.

Set a duration and amount

H₂O Timer amount picker showing 250.50 mL dialed in across two connected wheels.

Dial in an exact dose

H₂O Timer running screen reading 250.5 mL at 05:00, with 4 minutes 52 seconds remaining.

Watch it count down

H₂O Timer completion screen reading TIME with a Dismiss button.

Time's up

Set an exact amount

Dial in a precise amount right alongside the duration — in mL by the quarter, or ounces down to a tenth. Track a glass of water, a measured dose, or anything else you portion out, and see both the amount and the countdown together while it runs.

One glance, one drop

A single droplet fills your screen and drains as time passes — no clutter, no numbers to squint at.

H₂O Timer running screen with the droplet nearly full, just under 2 hours remaining.

Hold to confirm

A two-second hold cancels or resets a timer, so a wet wrist never taps something by accident.

H₂O Timer running screen mid-hold, a cyan trace tracing partway around the droplet's outline to cancel.

Never miss it

Haptics, a gentle chime, and a lock-screen alarm let you know it's time to drink, even if your wrist is down.

watchOS notification reading Alarm from H₂O Timer, with Open and Stop buttons.

A quiet log

Every timer is recorded automatically — completed or cancelled — so you can check your day at a glance without any typing.

H₂O Timer history list showing completed and cancelled timers with timestamps.