Why not just blow out the water lines with an air compressor. It doesn't take much of a size compressor. First drain all the tanks like the water tank and the hot water heater, turn the tap to isolate the water tank and the water heater, then connect the compressor up to the city water inlet. blow the lines for about 15 minutes by opening all the taps, flushing the toilet, etc. Don't forget the taps that might be in the dumping area. Then go through and open all the taps one by one to make sure that all the water is out. Pour some Pink Stuff down the toilet and the drains, and you're done. No water to freeze anywhere. If you have an ice maker, don't forget that.