Bypass the water heater, drain water heater, open low point drains until no more water comes out (opening a faucet while doing this makes it go faster), close low point drains, use bypass kit to pump antifreeze in to all the lines, open one faucet at a time until pink stuff is clearly running, do every faucet (hot and cold), shower, toilet, outside shower, etc., pour some antifreeze down all the drains. Done
Next spring pump freshwater through lines until pink clears, un-bypass water heater, sanitize fresh water system, ready to go camping.
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