I blow my waterlines out so they don't freeze, but always pour some RV antifreeze into the sink and shower traps so they don't bust. I was at Lowes today (Sanford), and found they have RV antifreeze on clearance, for a buck a gallon. Marked 4.98. They had a couple of pallets with maybe a few hundred jugs. Not a bad deal at $1 if you need some.