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How to make fog
Heat water until it's very hot, but not boiling.
If your tap water is very hot, you might be able to use this water right out of the tap. You can also heat water on the stove, or fill a glass container and heat it in the microwave.
The water should be hot to the touch but not quite boiling. Aim for a temperature somewhere between 120 and 180 degrees fahrenheit (49 and 82 degrees celsius).