A while ago, I proposed a strawbale cold house, split in half, with one half filled with water barrels that were allowed to freeze, and the other half for cold storage. A fan would move air through the insulated partition wall as needed. The barrels would be frozen by running a fan from outside air during the winter.
However, according to one source even a partially filled barrel will bulge and fail. I'm not impressed by the thought of three high stacks of round bottom barrels either.