[nugget]

Your reference to orthorexia is extreme. There's nothing in the parent comment that would take my mind there. It's true that relatively few people realize how polluted drinking water has become - lead and other metals, PFAS, plastic particles - take your pick. I have a hard time understanding why any knowledgable person who can afford to do so wouldn't filter all or almost all of the water that they drink and cook with at home. OP also didn't mention distillation as a filtration method. A reverse osmosis filter with a remineralization stage is vastly more popular and a no brainer to install in any kitchen. If you do drink distilled water then you can supplement with an extra pinch or two per day of salt and minerals in your food and you will be fine.

Orthorexia and OCD tendencies are real and destructive but I'd be equally wary of normalizing the oftentimes highly toxic exposure of modern life to the point where anybody who express tangible concerns and takes meaningful countermeasures is pointed to as a potential basket case.