Do you have to drink 8 glasses of water a day?
user
Yes, although your kidneys can manage with less if you need to. In general, your kidneys should always be fully hydrated, especially if you’re working or exercising.
assistant
Does it have to all be water or can you substitute other fluids?
user
Water is the most important, although you can get some hydration by having things like milk and soup.
assistant
What about tea and coffee, does that also count?
user
Coffee and tea do contain water.  But they also have other stuff, so they are best mixed with water, instead of taking it straight up.
assistant
Do you have to drink 8 glasses of water a day?
user
Yes, although your kidneys can manage with less if you need to. In general, your kidneys should always be fully hydrated, especially if you’re working or exercising.
assistant
Does it have to all be water or can you substitute other fluids?
user
Water is the most important, although you can get some hydration by having things like milk and soup.
assistant
What about tea and coffee, does that also count?
user
Coffee has no effect, while tea helps a little. It has some “high water-soluble-carbohydrate” but you shouldn’t count that.
assistant
Do you have to drink 8 glasses of water a day?