Without a compressor or electric your only way to blow out the lines are with an air tank, a portable compressor (with a tank) that has already been pumped up to full capacity, a bicycle/air mattress pump, or using your mouth/blowing on a garden hose! (yes it can be done! LOL!)
As mentioned though, if you are going to pump antifreeze into the system, blowing out is not a REQUIREMENT but rather a way to save a bit of antifreeze. Using the low point drains to drain the plumbing, as cavie mentioned, is perfectly fine.
When you blow out a system with air and then ingest antifreeze into the plumbing you are fairly certain when the pink begins to flow it is pure antifreeze.
If you don't blow out the system first, you 'could' get water (left behind from simply draining via the low point drains) or a mixture of water and antifreeze coming out the faucets before it turns pure antifreeze.
With the price of antifreeze being just a few dollars a gallon, it really doesn't matter much in the long run as long as you have enough antifreeze and then run it long enough to be sure no water remains in the plumbing.
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