I'm guessing that you mean coffee will just dehydrate you? not water
Caffeine does have a diuretic effect, but it is mild. It isn't like you drink a cup of coffee, and pee out 2 cups, and become hydrated. You just may need to drink a little more after consuming caffeine, but it is ozs more, not cups. Coffee, and tea are just flavored water, and will hydrate you, just not quite as much as plain water, because of the caffeine.
If you want, you can drink decaf, but since the diuretic effect is so minimal, if you feel dehydrated, drink another glass of fluid ( 9 ), and you will still be hydrated. Then you can enjoy your regular coffee.
People overestimate the diuretic effect.
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