Just Wondering...

[amber]

I fill up my water bottles at the de ionizing/filter machine at Whole Foods or the Glacier fill up station at Safeway. One gallon, 30-39 cents. I drink tap water, too, but i don't think I should around here. (It's very polluted here, and the ladies in Marin have something like triple the national average for breast cancer).
But I sometimes don't get water in time since I have to make extra grocery trips because I carry it in my backpack.
Anyway, I like the fill-up-my-already-used-gallon-containers myself method, rather than buying bottles and bottles and bottles of water. And I almost trust well filtered water more than "natural spring" because in my head, there are few places that pollution does not reach - if air is polluted, and rain falls from it, then bam, pollution. Although there are still a few clear areas.
The thing is, you can get actual reports about the quality of your water in the area. Also, you could get a Britta filter for your tap. A girl in my enviro law class who works for a chemical testing place said that Britta filters out the things you'd be worried about.
I'm sure you could find a lot more info online if you looked. I've also recently learned more about the process of filtering water, and it is pretty thorough. So if you have tap water once in awhile I don't think you'd suffer adverse effects.