Naio, actually my son found it at the local Wal Mart. It was back in the section by the ice chest and water bottles. But I've seen them at other places like the local Water And Ice, an RO water place here. They look like the water fountain type bottles but have a spigot on the bottom. We only use "store bought" water for cooking and drinking/coffee when we're out.
Harvey51, here's a link to Harbor Freight where I got mine. I got the $34.95 one and it works great. We use it to transfer water from our 45gal water drum, we carry in our truck, to our fresh water tank when we're boomdocking. Just mounted it to a small piece of wood and run it off the house batteries. It has regular water hose fittings so easy to hook up.
