Less than ten percent of the salts and minerals we intake come from drinking water. As long as you’re still eating normally it wouldn’t affect you much at all. Source : [The Contribution of Drinking Water to Nutrition](https://www.ncbi.nlm.nih.gov/books/NBK216589/)
Water intoxication is probably what it’s being conflated with. This can be caused by consuming too much of any freshwater, not just ‘ultra pure water’. This effect is because your body relies on sodium concentrations for many metabolic processes; if you have too much water your salt levels become too diluted and these fail. Source: [Fatal Water Intoxication](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1770067/)
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