| You can use any kind of tub, or bucket - even a large ice chest. Pour in water, then add dry ice. There needs to be enough water to cover the dry ice - figure about 2-1, water to dry ice.
The warmer the water, the more the smoke and the quicker it will dissipate. Cooler water will produce less dense smoke but it won't go away as quickly.
If you want to have directional smoke, pour water and dry ice into a shop vac. Point the vacuum hose in the direction you want the smoke to go.
If you don't already have the dry ice, look in your phone book for ice places. Sometimes Baskin Robbins (or other ice cream shops) will sell you small quantities.
NOTE: Please us cation when handling Dry Ice. It is extreamly cold and can burn the skin if handled