That all I really drink is water. Only once in a great while will I drink something else, but I do water at least 99% of the time, and nothing added to it, it tastes just fine on its own. Used to drink many years straight from the tap, but damn chlorine and other chemicals are just nasty and it got worst as the years went by (where it started tasting like I was drinking pool water), then I went to bottled water (but that tasted like plastic chemicals), eventually this led to getting one of those pitchers with the filter in them, that's how I do my water now, clean of most impurities, very fresh non-taste (water shouldn't have any or barely a flavor). I don't count how much water I drink in a day, just drink when I get thirsty, my body tells me when (the body will always tell you when you need anything), which is quite often.
Its funny but screwed up, but so many years my mom and brother used to get into arguments about him drinking too much soda (that and juice is all he ever drank, never just water, he used to say he'd rather dehydrate), he'd always answer sarcastically, "Soda has water in it." Logically it makes sense, to him. But somehow the results are not the same, all that crap in it.