Every water tracker ever printed carries the same ghost: eight glasses a day. It's a fine round number with a fuzzy pedigree, and the actual reference work is far less tidy. When the National Academies set dietary reference intakes for water, they described adequate intakes that vary by person and circumstance, noted that normal drinking behavior — mostly led by thirst — covers most people, and counted water from food and every beverage, not just the virtuous clear kind. Public-health guidance like the CDC's page on water and healthier drinks takes the same shape: drink water instead of sugary drinks, carry a bottle, let the day tell you how much — no universal quota.

So this tracker does something mildly radical for its genre: it doesn't tell you how much to drink.

A line you set, a week you can see

The sheet has exactly two ideas. First, your daily line — a dial from four to twelve cups that you set and can change any day. Hot week, long runs, big talking days: raise it. Quiet desk week: lower it. The line's job isn't to be correct; it's to be yours, because a target you chose gets tapped and a target you were assigned gets abandoned.

Second, the running week. Seven day-rows, today ringed in gold at the bottom, each row holding your line's worth of cup squares. Finish a cup, tap the next square, and a pen-blue checkmark stamps in with a little spring. Tapped one too many? Tap it again and the fill walks back. Forgot yesterday entirely? Backfill it honestly — the sheet doesn't mind, and the record stays true.

Days that reach the line earn a quiet handwritten at the line ✓ — a nod, not a firework, because the last thing water needs is a performance review. Under the week, one italic sentence keeps the only score that means anything at this scale: four of seven days at the line this week.

Why a week, and why so plain

Single days lie. One dry Tuesday says nothing about you, and one heroic Saturday fixes nothing. A rolling week is the smallest window where a pattern is real — enough to notice that afternoons are where the cups stop, or that the line you set in January is fantasy in July. The tracker rolls forward on its own: no resets, no archives, no streak to lose. It measures attention, not obedience.

And attention is the actual mechanism. A tracker doesn't hydrate anyone; it keeps the question when did I last drink something? pleasantly unignorable. That's also why the sheet prints clean — day rows, cup squares, your line — for the fridge door or the desk pad, where a paper week and a pen do the same quiet work.

If tracking one small daily thing turns out to suit you, the daily habit tracker runs the same honest game for any habit, ten weeks deep. Water is just the easiest place to start: the cups are already in the cupboard.