Due to the issues some of us have with the amount of water needed in our tanks before the pump will pick up and the difficulties of draining them completely, I am thinking of rigging a 5 -7 gal. portable tank in the basement and using the antifreeze tubes for the pick up. This will provide water for toilet flushing and hand washing while on the road. We seldom drycamp so I do not want the weight or problems associated with filling the rigs FW tank for travel. Does anyone have suggestions as to where a 5 to 7 gallon potable and vented water tank can be purchased?