How about the sterno can ???

We are using all cans for stoves , why not sterno cans ???

After it is consumed fill with perlite and ... you don't even need any screen.
Use the lid to extinguish the flame.

There is an advantage to using the sterno can in particular.
You can take a sink drain , remove teh center screw and rubber ... Then put it UPSIDE DOWN on the sterno can. It sits just right and will serve as base for the pot.

Not my idea.
I just stole it from U-tube.