Blowing out water lines?

I drain in the fall, hit the bypass for the water heater, pull the plug. (Mine does not have an electric element). Then I blow out the lines and suck in a little antifreeze. Fill the traps too. When it's finally above freezing for a week here all week. (So far, no joy) I Sanitize and fill the system. I don't drain it again until fall. I keep it full of water in the yard, as a power outage or two have caught me in the past and at least I can still have water/shower. (On a well). I don't travel with that water typically. (Weight)

I don't think you harmed anything... just a lot of extra work.