Hydration Log
Track daily water intake in millilitres.
Overview
The Hydration Log tracks daily water intake in millilitres, plain and simple. You tap a preset for the glass, bottle, or mug you just finished, the total updates, and the day's running tally is visible against your personal target. Over a week the pattern is honest: most people drink far less than they thought, or far more on training days, and the log surfaces this without judgement.
The case for tracking hydration is strongest for athletes, anyone on medication that affects fluid balance, parents managing kidney-stone risk, and people who notice headaches or fatigue that track with low intake. For the general user, even a week of logging is enough to recalibrate intuition and decide whether to keep tracking or not. Either outcome is useful.
How it works
You add entries by selecting a quick preset, such as 250 ml, 500 ml, or 750 ml, or by entering a custom amount. The day's total is shown alongside your target, with a progress indicator that moves as the day goes on. Days roll over at midnight; older days are kept as a history view for the past two weeks or longer.
Entries are stored in your browser's local storage. There is no account, no integration with a smart bottle, and no third-party data flow.
Examples
- Logging a 500 ml bottle after a morning run, putting you halfway to a 2 litre target by 9 a.m.
- Tracking three 250 ml cups of water at meals and noticing how few they add up to compared with intuition.
- Adding a 750 ml bottle as the day's afternoon block on a hot day, with a note about ambient temperature.
- Logging a low-intake day during a head cold, useful context to share with a GP if symptoms persist.
FAQ
What target should I use?
Common adult guidance is somewhere between 1.5 and 2.5 litres of plain water daily, with adjustments for size, activity, and climate. Your doctor's advice trumps any default.
Does it count coffee, tea, or soft drinks?
The log focuses on plain water. You can include other beverages, but you may want a separate caffeine log for the caffeinated ones.
Why millilitres rather than cups or ounces?
Millilitres are unambiguous and comparable to most bottle labels. If you prefer cups or ounces, convert at entry time.
Does it ping me when I'm falling behind?
The current day's progress is visible whenever you open the log. The tool itself does not send push notifications.
Is the data private?
Entries stay in your browser's local storage. Nothing is uploaded.