My tap water is pretty bad. Not as bad as water was in Florida tho. I tried out a good-quality filter but it was meh. Finally sprung for Poland Springs. It's pretty freakin' expensive for just water (like $37/mo), but the water quality is better than bottled water, it's ice cold, and very satisfying. Never thought I'd turn into a water snob, but whatever...it makes me drink more water than I normally would because it tastes good & it's cold. My family also drinks more water because it's not gross, which I prefer them to drink over the sugary stuff. The hot water feature is also really nice for different things like a quick hot chocolate or Ramen noodles or whatever.
I hate the price, especially having to pay for it monthly, but as I am a fan of the health properties of drinking water over junk drinks, I feel it's worth it since everyone in my family actually uses it on a daily basis, which I think is great. As Carson Dyle mentioned, lugging it in the house is a bit of a chore & storing it is kind of a hassle since I have a small place, but we make it work.