how do I do it?

The easiest way is probably to use a LITTLE lighter fuel (liquid, for Zippos and the like) and normal ice cubes. If you can make an indentation in one of the cubes, put a few drops of the fuel in the dip. As the ice melts, the lighter fluid will float on the water, so it's best to do this all on a metal tray, ideally outside or somewhere where you're not going to set yourself or the house (or anything you don't want to!) alight.
 
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