I prefer tap water I suppose, but past that I am picky in the sense that I will only drink cold water. I cannot stand room temperature water... if I had to pick between room temperature bottled water or barely-cold tap water though, I prefer room temperature bottled water I think
I refill a bottle for the fridge and put it in there, then refill a stainless tumbler throughout the day
If we really get in to it, brand wise, if I am at a store and they are selling water I am likely to buy Life Water, Dasani (yes I said it
I think it is different by region, it tastes fine here...), or Core. I cannot stand Aquafina, Evian, or Arrowhead (a regional brand I think).
I do LOVE water, though... a lot.
I drink it all day every day.