We don't use antifreeze. First off we drink the water on board and despite rinsing I'm not keen on ingesting any residue. We drain and flush the waste tanks. We drain the fresh water tank, remove the annode rod from the water heater, drain the lines and using compressed air blow all the lines. The water filter is removed (filter replaced, housing scrubbed clean).
How low does antifreeze do? Dunno but it does reach minus 40 here. I'd rather have no water to freeze than hope the red juice works. We do use the red juice in the drains.
Why is blowing out the lines better? Saves time when you are adding water - and no potential for chemical red juice consumption!