If you dont have a small cauldron, use a small mayonnaise jar or other container that will give you the basic shape. You can even use your fist for a unique looking cauldron. Kids especially love to do this. You will however need to make legs for the cauldron. Simply use your little finger or a chopstick and press into the bottom of the mold three times.
Hot wax is highly flammable and can burn skin - so be extremely careful.
If you wish to make black cauldrons, add left over black candles or wax to can. If you dont have any, you can add black crayon pieces until you are happy with the color. Of course, if you want a different color, use the appropriate wax or crayon. Press the wicking directly into the sand at the center of the mold. You will need to drape the top of the wick over a pencil or meat skewer that is placed over the top of the mold - preferably resting on the top of the box, to keep the wick from falling into to wax once it is poured.