"Drink water, you'll think better" is one of those claims that is repeated so often it stops being examined. It is not nonsense. It is also considerably smaller than the way it is usually presented.
General information for everyday working life, not medical advice.
What is reasonably established
Research on mild dehydration and mental performance has found effects on things like alertness, perceived effort and mood — and, in several studies, on headache. The direction is consistent enough to take seriously.
The size and reliability are another matter. Studies vary in how they induce dehydration, how much, in whom, and what they measure; effects on complex tasks are less consistent than effects on how people feel. Reviewers in this area generally describe the evidence as suggestive rather than settled.
Why offices produce this in particular
Not because the work is demanding but because of how the day is shaped. Air conditioning is dry, the water is across the room, meetings run over, and the strongest cue to drink — thirst — is easy to miss while concentrating.
Add a commute that already cost fluid before the day started, and a mid-afternoon slump gets attributed to the workload. The commute half of this is covered in hydration while commuting.
What actually works at a desk
The desk-level version of all of this, including what to do about the bathroom-trip calculation people quietly make, is in hydration at a desk.
The honest caveat
Water is the smallest of the levers on how well you concentrate. Sleep is larger by a wide margin, and so are workload, interruptions and whether you ate. Anyone told that a hydration habit will fix their afternoon has been sold something.
What makes it worth doing anyway is the cost. It takes no time, requires no equipment beyond a bottle, and removes one avoidable reason for a bad afternoon. That is a reasonable trade even if the effect is modest.
It also sits inside a larger question about how a workplace treats recovery generally, which is the subject of stress and everyday recovery.
Sources
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