Your right on the ball with the 5 gallon idea. Ideally, you want to use a insulated container, to keep the "cold" in as much as you can. The best way to insulate it would be to buy an Igloo (TM)-type brand cooler. I don't quite understand what Bigben meant about finding problems, but try what I suggest.
As for the coolant, try a 50/50 solution of glycol and water. You will love it.
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