Ok, I know there's another cheaper version already on this page, but I got this from the Froggy's fog Rep. himself. If you refer to my masterful drawing that I've attatched you will see a perfect representation of a garbage can chiller. Ha ha.
According to froggy man, the best can to use is the grey "Brute" by Rubbermaid. Either the 33 gal, or larger will work. They've worked this out with different brands, and the thickness of the wall of the can makes a difference. Metal transferred too much heat from the outside, etc.
The inlet end of the inner hose is supposed to be about 4 inches from the bottom. The outlet, was supposed to be 2 or so. There is supposed to be a 1 or 2 inch gap between the fogger and the opening where it goes in at the bottom. You would think you would want it sealed, but froggy man says that it causes a venturie effect, and makes it work better, you can experiment with this yourself.
The inner hose is just inexpensive dryer vent hose, about 20 feet worth. You want it to go up through the middle, and the coil around itself all the way to the bottom. It's not easy to get it done, but the more times it coils, the better it will cool the fog. He cautioned you not to run an exhaust hose too far from the can, or the fog will start heating, and it will not be as effective. He suggested to keep it short, like 15 feet, if i remember correctly.
After you have wrestled this mess of hose into place, you add ice in the middle of the coil. He suggested adding a layer of salt, represented in white in the awesome drawing, then ice, represented in blue. Layer it all the way to the top, and you've got the super chiller.
I will be making one, and will let you know how it works out, but it sounds like this guy has messed around with this a LOT, and I believe him when he says it is the best chiller that you can make. Just wanted to share one of the many things that I learned at the West Coast Haunters Convention. I did this from memory, so forgive me if you see a flaw in the origional design. And please correct me if I'm wrong.
One thing that he didd'nt mention was a drain hole in the bottom, I would think this would be necesary. But I would caution you not to kill your grass with salt water, so I would either put the chiller somewhere it could drain safely, or not use salt? If you wanted to get fancy you could tie in a drain line hose below the exit hose, and run it into a rain drain or something.