Im building a system to pull water from my gutters and use it for flushing toilets. My question is on using such a system in the winter. I'm concerned about the water freezing/damaging the setup. I'm using 55-gallon plastic barrels for storage, and flexible hoses (which I would think would stand up to freezing better than PVC). How likely is it for a barrel full of say 30 gallons of water to freeze and damage the barrel/system? Anyone have a similar setup with some experience that can help me out?