From what I can "tell", the vast majority of posters use some kind of external filter. Some use the in-line filter in their fresh water hoses, some have stand-up filters they place on the ground when camping, and some have brita pitcher filters inside the cabin for drinking water. Personally, I use a small inline filter on my water hoses, and fill up a 2 and 1 gallon jug from my home RO before leaving - sold for coffee and drinking water. I am considering getting either a Brita or checking out to see if my sink faucet is comparable with and strong enough for a clip-on Pur filter.