We are all tap water, all the time (of course, our local tap water is suitable for drinking, I realize there are parts of the country this isn't true). If we buy bottles, it's only if we're out of the house and it's the only option or if we're camping or something. And then we refill the bottles at home with tap water to take in the car or outside, etc. I don't trust that most bottled water isn't mainly just tap water anyway, and I don't trust water that just sits for a long period of time.
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