RV antifreeze works well, however its always a chore to get the stuff out of the lines every spring. Some may argue that there is no taste/residue, but I have a hard time ingesting all those chemicals.
My suggestion...find a small air compressor and blow out the lines. Make sure you empty the hot water tank and leave the drain plug out as well.
If you are thorough, its a better alternative to antifreeze in my opinion.
WARNING...do not just drain the lines.
WARNING...make sure ALL the stop valves are opened.
WARNING...make sure routing lines to your hot water tank are cleared of water as well.
Any residual water will find a low spot to pool and will freeze and bust your lines...
Good luck with whatever you decide...
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