For boondocking and dry camping, I use an 60-gallon AQUATANK2 (other sizes are available). It fits nicely between my fifth wheel hitch and tailgate. I use the camper’s on-board water pump and anti-freeze inlet to suck water from it and push it into the freshwater tank. Works well, folds up really small, and is lightweight when empty. I added quick connects to the hose ends to make it easier to connect a hose to it (quick connects are love!).