disconnect the lines from the tank, that should drain most of the water. There was a petcock on mine similar to a radiator petcock, opening that drained the rest. I went to my favorite hardware store and picked up a braided SS water supply line about a foot long.....toilet supply line as I recall, then added a couple of fittings to the end of that so I could screw the water lines from the tank into it. Winterized the fresh water system with pink RV antifreeze.