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About this tool
Work out how much water a study session needs from EFSA daily intake values and get a sip schedule sized to your bottle.
This tool works out how much water one study session needs by pro-rating the EFSA adequate daily intake — 2.5 litres total water for adult men, 2.0 litres for adult women, of which about 80% normally comes from drinks — across a 16-hour waking day, then converts it into a sip schedule sized to your glass or bottle. It is built for students who forget to drink during long revision blocks and end up with a headache by evening.
Open Study Hydration Reminder on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Targets come from EFSA's 2010 dietary reference values for water, split by sex and age band — not a made-up 8-glasses rule.
Tell it how much you comfortably drink at once and it computes how many drinks and how far apart.
A hot-room toggle adds a clearly labelled ~20% uplift, since needs rise in warm conditions.
Pro-rated from EFSA's daily values, a 3-hour study block needs roughly 300-375 ml for an adult — about two to three small glasses, spread out rather than downed at once. The full daily reference is 2.0 litres of total water for adult women and 2.5 litres for adult men, with about 80% of that normally coming from drinks.
Yes — studies of mild dehydration at around 1-2% of body mass loss report measurable dips in attention, short-term memory and mood, which is exactly the range you can reach by simply forgetting to drink through a long study day. Steady sipping prevents it without bathroom-break disruption.
It has no clear scientific origin. Formal reference values are set by bodies like EFSA — 2.0 to 2.5 litres of total water per day for adults, including the roughly 20% that comes from food — and actual needs shift with body size, heat and activity. Thirst plus pale-yellow urine is a better practical check than glass-counting.
If your exam centre allows a transparent water bottle, yes — small sips are sensible in a 3-hour paper, especially in summer, and research on students allowed water in exams has associated it with slightly better performance. Check your admit card or centre rules first, since policies differ between boards.