Hubby's response to me is always: we have a 16' x 32' swimming pool full of water in the back yard and 4 toilets from who's tanks we could drink water. :o)
Well then, if you're not going to buy extra water, you're going to need alot of bleach if you're going to drink THAT! ;-)
My pool usually contains the large patio table. We throw it in there instead of bringing it in if space is at a premium in the house. The garage is too far to lug that thing into there.
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.