Your body monitors the amount of water you need minute to minute. Too much water is bad because it’s extra strain on your heart and dilutes important stuff. So drinking a lot all at once means your body sees your needs being met plus excess – so you pee it out. But over the course of the day you use/lose water, mostly through super tiny moment-to-moment losses like sweating (you’re nearly constantly micro-sweating) and breathing (you lose a bit of water vapor in your breath), and that needs to be replaced. Additionally, you need water to get rid of waste like urea (where the word urine comes from), even if it means drying you out a little bit. This water also needs to be replaced.
So because you’re constantly losing water and the body doesn’t really have a big tank to store it in, it’s generally better to space out drinking it.
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