What you needLarge container
Start by taking a large container that will hold several liters of water.
Place the dry ice into the container and add enough water to cover the ice.
The warmer the water the more smoke the ice will create. But the ice will melt faster.
Dry ice looks great bubbling out of a witches pot. Paint a stew pot black for a witches brew pot.
You can get dry ice from ice supply stores. Check your local directory for party supply listings.
Skin should NOT come into any contact with the ice as it burns the skin. Children should not be left unattended with the ice or witches pot.