Me? I'd simply load a regular fog machine with distilled water and shoot real steam out though piece of copper pipe. Remembering , of course, to establish a safety protocol. The steam comming out of the fogger will be hot enough to scald an actor who is too close. Even at a moderate distance it should be cool enough. By using just distilled water you don't have to worry about the fog hanging around. You should be able to buy a really cheap fog machine from "party city " or a similar retailer if you don't already own one. Oh, if you choose to use a foggerwhich has been in operation already, you will want to clean it out first. Make a 50/50 mix of Distilled water and white vinegar, run at least 1/4 of a liter through your machine. This will make sure you don't get residual fog hanging in the air.
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