Bars require no permit, and you can serve, bloody martys, milkshakes , or all the olives and onions you want to in your martinis, as they are all considered drinks, regardless of the garnishes and such.
There is a gray area regarding barsnacks and such but I believe it will slide as long as people aren't lining up just to eat your bugles and Peanuts.
Just be sure to keep you scoop for the ice out of the ice container and you should be golden.
As long as you aren't serving up prepared foods or foods for the masses, you don't gotta have a permit.
I am not 100% sure, but I think you gotta have a permit to serve snowcones, unless it is just for your friends, of course.
We have an obligation to make space for everyone, we have no obligation to make that space pleasant.