Sorry for your freezing issues.
Around here, especially in SW lower Michigan, there are a lot of seasonal cottages due to the large number of lakes. If you don't want to leave the heat on all winter, they have to be winterized. My grandparents did it annually before leaving for Florida for the winter.
They'd shut off the water well at the circuit breaker.
Drain all of the plumbing through a spigot next to the pump.
Shut off and drain the water heater.
Fully open every faucet on every sink, hose bib, etc.
Flush the toilet to drain the tank.
Pour anti-freeze into the toilet and every sink drain trap.
They never blew out any pipes, but that couldn't hurt. As others have mentioned, you can easily put air hose fittings into your system like they do to blow out lawn sprinkler systems.
Look on Youtube for videos on how to winterize a cabin or cottage and there's quite a few that give step-by-step instructions.