The demineralized water at the hardware store isn’t rated for human consumption.
Selling drinking water requires you bottle it in food safe bottles, in a sterile facility that has been inspected, while getting your water from a safe source that has been tested.
Demineralized water generally starts with perfectly safe water from a municipal source, but it’s bottled on equipment that they don’t bother rating/inspecting for human drinking. It’s cheaper to just put a tag on it that says NOT DRINKING WATER.
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