Pure (aka deionized) water tastes bad.
It’s very acidic from absorbing CO2 from the air. Last time I measured DI water that’d had been sitting out for a few minutes the PH was around 3-4.
It won’t kill you, but it’s definitely hypotonic and will pull salts out of your cells.
Distilled water is fine to drink. It still has salts in it. Mineral water has even more salts in it. Deionized water is the stuff you should avoid.
EDIT: DISTILLED WATER IS NOT PURE WATER. Deionized water is pure water. They are NOT the same thing. Distilled water still has a good deal of stuff in it.
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