I don't know much about the subject of water for herps. But in my Environmental analysis class I learned that in Canada at least unsure on the states but there is no regulations on bottled water. That said do I think bottled water is bad for you? no I drink it all the time. But there is still no regulations on it to make it better. The only reason a bottled water company would care would be to obviously not make you sick so you continue to buy there product. Now you look at tap water and tap water has loads of regulations on it. But they don't necesarrily always fall into these regulations and can still be harmful to you. The city I'm from Winnipeg Mb, Canada. its tap water isn't the greatest almost everything that is regulated as far as tap water goes the limits on it are above the standards set. The city is working on a new water treatment facility to improve this but it won't be done for a couple of years.
Those brita filters generally only aid on taste and clarity they don't filter out harmful contaminants if they exist.

So all that said what is a person supposed to do?

I have no clue just thought I'd throw my in