Aren’t you still drinking the water?
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Caffeine is a diuretic, which causes you to need to urinate. Urine is the body pulling water from the system to expel things. If you were to drink very, very highly caffeinated coffee it could trick your body into expelling more water than it was absorbing from the coffee itself, leading to dehydration. This is a more extreme case, in general coffee will hydrate you more than it dehydrated you.
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