I drink bottled because I don't like the hint of chlorine/flouride in Calgary's municipal water, which, oddly enough, seems more intense when the water is very cold as opposed to when it comes out of the tap. I used to refill my bottles and refrigerate them, but I stopped due to that more noticable chemical undertaste.
I drink Aquafina quite a bit (I like Evian too, but the extra expense doesn't seem justified), and I already knew they used tap water to make it; however, since it is PROCESSED after that, I really don't see what difference that makes. It's not like they are pouring it straight out of the tap into the bottles; I think labelling the bottles as "sourced from municipal water supplies" is less accurate than what is on the bottle right now in front of me, "Demineralized Treated Water".
PS - Aquafina still has a flouride content of .3 ppm, which is about a third of the Calgary water supplies 1 ppm content. So if you're looking for non-flouridated water, spring water is what you want, although if you look on this page
http://answers.google.com/answers/threadview?id=521352 you will see that spring water may also contain flouride, which can occur naturally. Reverse osmosis is unable to remove all flouride ions due to their size; there is a nifty chart at
http://www.freedrinkingwater.com/infocenter.htm that shows you common contaminants that are filtered out by different filtration processes.