[ksaj]

Distilled water and pure H2O are not the same thing.

Pure Water Can Kill You http://isciencemag.co.uk/features/fact-of-the-day-1/

[kadoban]

That article is...suspect. Water poisoning is a thing, but it's a thing with normal water too. https://en.m.wikipedia.org/wiki/Water_intoxication

As with everything, the dosage is important and the article doesn't mention it being any different than normal water.