I wonder about this sometimes. I've heard that purified water lacks many minerals that you should and would get from tap water. It really does depend where your tap water is from though, some is far better than others and yes soem tap water can be down right dangerous.. so if you're not sure maybe just drink the purified. Personally I only drink tap(unless I'm out somewhere), it's cheap and the water is fine where I live(I think hehe).
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