Hydration is the single most underrated context line in a weekly log. Not because drinking water is some miracle — it isn't — but because it explains a lot of the noise in everything else. Energy drops, headaches, the day where the routine just feels harder than it should — a meaningful chunk of those, in retrospect, line up with one or two days of light water intake in the day or two before.
The mechanism doesn't matter for the journal — the pattern matters. The point of logging it isn't to be perfect about hydration. The point is to have the context line on the page so when you come back and try to explain a hard week, you can look at the water column and see it's been blank for three days.
Format is dead simple. One word per day or per week. 'Yes', 'light', or 'no'. Or a fluid amount if you're the kind of person who already measures.
Doesn't matter — the consistency of the tag matters more than the precision of the measurement. The week-over-week comparison is what makes it useful. Titra has a notes field and a tag system.
Stick water at the top of the weekly entry next to sleep, treat it as a context line and not as a goal, and the patterns surface across a couple of months. You'll explain more hard days from water and sleep alone than from anything else you log.