I bought the Dollar Tree versions which float. They plug into usb power so any usb reserve battery or converter works. They are sealed inside a flotation donut and are placed on a pool of water. It continues to run emptying the bowl. With this, a small solar panel, a rechargeable battery and all sitting in a bowl..... voila, mystical scary vapors coming out of any tree stump or ledge and the rain refills the bowl. Permanent installation.Look up "atomizer circuits", these are normally intended for magician tricks, but I'm sure you can see how these could also be useful for props, scale models and the like to turn water in a sponge into a small plume of mist. Eliminates the need to take apart a cheap vape pen (the ones you combine with a small aquarium pump to make ghost traps smoke).
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I am putting them to use as my fog on top of the Bill and Ted's phone booth at our local country store. There is a 2 inch lip up top to hide all the parts.