So here's the idea. Our rescue squad is hosting a Haunted Trail for a fundraiser. We have a dunk booth we plan to convert to a witch's cauldron. Tank area to have 1 or 2 kids inside, screaming for help (too sick?). The tank won't have water in it. Was thinking about wrapping the tank with black plastic. Undecided on how to make fire or glowing coals at bottom of tank. Any suggestions on the cauldron, coals, etc.