I made a Dry Ice Fogger years ago, it worked great. It was a plastic barrel with a plastic flexible hose hooked close to the top. The barrel was put on a wooden stand and had a spicket on the side at the bottom for draining when done. Put on the water, easily put in the dry ice when needed, turn on the fan at the end of the plastic hose.
Only bad thing was I had no way to shut it off once I put in the dry ice. I don't even thing they made fog machines back in those days.
Now I have a fog machine that I have not used in about 5 years. My contract has a whole paragraph about the liabilities involved and that the purchaser assumes any and all cost resulting from the use of fog, and the cost of any permits needed for it.