Go to home depot and buy 20 feet of 3/8" copper refrigerator tubing, 10' of 3/8" vinyl tubing, 3 hose clamps, and a garden hose adapter. Should run you about $30 (half of what a commercial chiller will cost). Just wrap the copper tubing around something round (I used a paint can), carefully bend the ends, cut the vinyl tubing in half, secure to the ends of the copper tubing with hose clamps, and secure the garden hose adapter to the other end of one of the vinyl tubes with the third hose clamp.