Well......... Typical Smoke ring shooters (like Kip-Kay's and other people's) require a fog machine in order to create the smoke needed for the rings. When fog machine's can cost in excess of $100 where I live, many may resort to dry ice. At first I tried just dumping some dry ice in the bottom and pouring some water in. Since the co2 is heavier than air, it just stayed at the bottom and I epicly failed. Luckily the solution is supper simple and cheap...
Some garbage bin or large bucket of some sort
A good sized container with a lid. (like a lemonade pitcher with a lid)
2 feet of garden hose
Ping pong ball or something similar
tape tape tape tape :D