Originally from Canada and I would use a fake lake with a mix of antifreeze and water in my pails. (2 x 5 gallons) Once engine was flushed I removed all plugs in block, drained water pump, and removed all water lines at lowest points.
I would recover most of my mixture with pails under exhaust ports at back of boat and under drain in bilge area.
I lived in AB where it gets colder than most parts and never ever had an issue with ant of my boats.
Spring just did reverse. Put plugs back in, hooked up hoses and fake lake, Started boat up, let water circulate and loaded ski equipment into boat to head to lake.
Oh I always stored my battery in my basement on top of a plastic milk crate so it wouldn't freeze.