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Wear it.
A small disc on a skin patch, on the back of your hand or wherever suits you.
A biometric sensor worn on the skin. On the back of the hand, or wherever suits you.

A small disc on a skin patch, on the back of your hand or wherever suits you.

Your hydration, measured at the skin, all day and all night.

A soft glow on the disc when you drift, and the detail in the app.

Two weeks to learn your normal. After that, one look tells you where you are.
Afternoons, workouts, hot days. See how your hydration moved across the week.
The coach explains what changed and what to do about it.
Battery, patch and glow, in one place.