I just got a 55 gal plastic water storage drum, and I want to store it full, outside in a shed. The problem is that I live in a cold-ish climate, and I want to know what I can do to avoid damaging the container when it freezes.

I currently store a few Wallyworld 6 gallon containers. I've had one of those split before, but they're cheap and I use them for camping. I don't want the nice big drum to split!

Anybody have any ideas on the best way to get the most out of this drum? And while I'm on the subject, I have 110 gallons of water storage in my travel trailer, but I always empty and winterize in the winter, so that's only for SHTF in summertime. Is there a way to safely use that space in the winter, other than heating the whole trailer?

For reference, I live in Northern Nevada, so it gets down to around zero a few times a year, and definitely stays cold for months. This Saturday has a high of 28 and a low of 7.