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I use a blowout adapter that works from a compressor. It's a tire valve with a garden hose fitting on it. I first blow the water out then hook up a 10' or so length of arden hose. Add antifreeze to the hose and blow it into flush pipes.
It does pretty much self drain and a little water won't hurt anything anyway. Just keep valves open. Damage occurs when the water expands and there is no place to go. If there's an exit point( valve or cap off) the water will expand in that direction without damaging anything.
Many just blow out the system and don't use antifreeze. I use antifreeze since it only takes 2-3 gallons. I'd rather spend the $10 than fix a broken pipe or fitting.
John
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