I've gat a barrell that I was going to use specifically for this purpose but never got around to it. You know how things go
. I think it's around 25-30 gallons, 20" diameter x 20" tall, with a tight fitting lid. Can be set up much like bloocrab's pic. If anyone wants it, it's free for the taking before my wife throws it away on me.
Let me know. First come, first served.