I use a bottling bucket and a submersible pump. I fill the bucket with cold water, put the pump in, then recirculate the water. I add snow to bucket as needed and open the spigot to make room for the added water (melted snow). Total water consumption is about 2.5 gal and takes less than 8 min to get down to pitching temps. Of course, snow is a necessary element of this setup.
On tap: Oktoberfest, Centennial Blonde, AHS American Amber, AHS Bavarian Hefeweizen
On deck: American Wheat