I blow out the water lines and the lawn sprinklers with a compressor. I also drain and blow out the water heater, I drain and plunge the toilets to remove as much water as possible. Then I put RV antifreeze in the toilets and push that through with a plunger.
Probably overkill but I have never had a problem. When I return in the spring there is still air pressure in the lines when I open the faucets.
Last week WalMart had gallons of RV antifreeze for about half the price of a gallon at Lowes.
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