Bottled water is not my first choice. I'm comfortable with tap water most of the time (because Scottish water is generally pretty clean and tasty). Let's not get into a discussion about fluridation though. I guess filtered tap water would do a good job.
What's this all about? Well, I read Valeria's post about bottled water and was reminded of this video (Penn & Teller and NSFW)
Watch this, then read Valeria (even if it is US-centric) and then decide what you will do next!
UPDATE: amended the links to Valeria's post.