I don't know about anyone else, but I can recall several times from my childhood (and it has happened a few times with my own kids) when I came down with really, truly nasty diahhrea after spending a day at the beach. One doesn't need to drink an 8-ounce glass of impure water to become sick--a few mouthfuls does the trick quite well. Kids just don't handle microbes as well as adults do.
His point is that if the house has collapsed on top of the saved water, what's the point. Sheesh!! Sorry I brought it up.