There are all sorts of things to be concerned about in drinking water: mercury, lead, estrogen, asbestos, other hard metals, plastics. Filtering standards for some are so low (or in some cases, not even screened for) that tap water can be frightening to drink. Most bottled water is either a byproduct of other drink production or lightly-filtered tap water, so have fun with that.
The cumulative effects, however, are still better for you than drinking soda, most juices, coffee, beer, energy drinks, etc.
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