Can you go into this in a bit of detail? I thought reverse osmosis water wasn't great to drink, because it's essentially de-ionized water. So, the water has no choice but to rip ions out of your cells. But, I've never looked into biology enough to understand.

I did work in a lab back in the day where one of the students was filling his water bottle from the DI tap, because he preferred the taste. He didn't drop dead or anything.

I clearly have just enough of the details to not understand.