Anchor it to what already happens
A new habit survives best when it is attached to an old one. A glass with every meal, one with every coffee, one when you sit down to work. Four anchors and the total takes care of itself.
Count boxes, not litres
Litres are hard to estimate and easy to fudge. Four or six tick boxes on a page are unambiguous, which is exactly what makes them useful.
Make it visible
The habit most likely to be forgotten is the one with no cue in the room. A glass on the desk, a bottle in the bag. Visibility beats intention every time.
Do not rely on thirst
Thirst is a late signal. That is the entire reason a tracker helps: it replaces a feeling you notice too late with a box you can see now.
Where this lives in a planner
Every technique above has a home on the Habit Tracker — Terracotta Warm — undated, A4, and ready for GoodNotes, Notability or a home printer. Not ready to buy? Download the free starter kit and try the method first.