Might wanna watch out for that though, at least a few brands just sell tap water bottled up, as tap water has more regulation (other than the fluoride, but there's no regulation there really), so they can guarantee passing regulation for the cheap price of municipal water.
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Thanks. Some use combined sources too. Not sure how informative the labeling of those are. I stick with two that have withstood scrutiny for a long time and have facilities at natural springs for sourcing.