Distilled water, particularly if heated, is dangerous to drink, according to some chemists I know.
The concept is that the ultra-pure water leaches potentially harmful ions from its surroundings, for example chromium from stainless steel fixtures. Better to drink some harmless sodium and chlorine ions.
I agree: in fact the deionization process adds one hydronium or hydroxide for every (mineral) ion it removes:
>Deionization is a chemical process that uses specially manufactured ion-exchange resins, which exchange hydrogen and hydroxide ions for dissolved minerals
In other words, if deionized water is unhealthful because of a lack of ions, distilled water is, too, because it doesn't contain any more ions than deionized water does.
"RODI" (de-ionized reverse osmosis) water can be as pure as distilled water, and is common in labs. I'm told you don't want to drink the lab-grade stuff.
The concept is that the ultra-pure water leaches potentially harmful ions from its surroundings, for example chromium from stainless steel fixtures. Better to drink some harmless sodium and chlorine ions.