Maybe it’s true, but it’s MISLEADING, you see. It gives people the idea that they need to buy bottled water to avoid dehydration, and this a BAD THING, since we all know that bottled water is a BAD THING, on other grounds.
The fact that for a lot of people it’s NICER gets completely lost. People might want to buy bottled water because it’s NICE. And you don’t have to wash and fill your own bottles.