I drink water throughout the day to hydrate my body and mind.

The four o'clock headache is very often not a headache. Neither is the irritability at five, or the fog that turns a simple email into twenty minutes of work.

Spreading it out is the point. A liter downed at nine because you forgot all morning isn't the same as steady supply; the body doesn't bank it, it processes the surplus and moves on.

The trick most people land on eventually is proximity. A bottle in eyeline, on the desk, in the door of the car. Not discipline, furniture. Almost nobody hydrates well through willpower, and almost everybody manages it fine when the glass is already within reach.