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I use air ... if you do it right, there will be no worries. Yes there will always be a little water left over in the lines here and there, but not the entire diameter of the water lines. The old copper lines were an issue, but today's plastic or PEX lines are very forgiving. If you blow thru all faucets, shower heads, stool, fresh water fill line, black tank rinse line, and outside faucets ... there will be no water in those to freeze. I do use about a quart of "pink stuff" in each P-Trap.
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