Also late to the party here, but in the case you are going to be away for some time, consider installing a drain valve in the water line, just after the main shut-off valve. Before leaving, simply close the supply valve, open the drain valve, and open all the faucets in the home, staring with the furthest, blow them through with an air line, then close them again.
No water in the pipes = nothing to freeze!! On returning to the home, close the drain valve, open the supply valve and bleed off each faucet in turn - takes about 5 minutes to do, which is a lot less than replacing split water lines and repairing all the water damage!
Lets see a stick home owner try that!!