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Basically everything counts. Tea, soda, energy drinks, coffee.

Generally speaking all these drinks are 98%+ water by volume. And hydrate exactly the same as an equal amount of water.

Corn syrup based drinks are on the rougher end but still no where near close to problematic for the goal of hydration. Typically calorie intake and caffeine over dose are larger problems.

But if your drinking an artificial sweetener based drink with low caffeine then you basically can straight replace water with it. Unless you have an out standing medical or health issue. Since while caffeine is a diuretic it's such a mild one that you would literally kill your self on over dose 10 times over on the fucking water in the drink it self before it actually became a problem for hydration. So it's really a moot point.

You should be more worried about your teeth than your kidneys honestly. Cause as long as your drinking literally fucking anything you are getting water. But your fucking your teeth up with acids and crap.

Really if your struggling with hydration it's likely cause your trying to drink your entire intake of water. You also need it from foods. Go eat some fruit and veggies. It helps more then a extra cup of water will.

You need about a quarter of your fluid intake from foods daily. People almost never get enough water from food.