Dry Ice Bubbles (How to trap dry ice in bubbles)
Instead of the dry ice just bubbling in the water to make foggy vapor, add a couple drops or so of dish soap (I use Dawn) in the water which will trap the carbon dioxide and water vapor in a soapy bubbles. Then you squeeze your hands it will explode the bubbles in your hands releases the gases in a fun fog.
Dry Ice Safety
http://dryiceinfo.com/safe.htm
CAUTION: Keep Dry Ice away from children if they cannot be closely supervised at all times
CAUTION: Make sure no little flakes or little pieces of Dry ice go into the water as they could get caught in the bubbles and burn your hand.