They are not so expensive because the materials used will be just throw away if not be used for this recycling innovations.
It can be also used by boy scouts in their overnight camping. It can be used to make hot water for their coffee or chocolate drinks.
Can cook also hot dogs, eggs and corned beef.
Cooking with this gadget is so clean because it uses alcohol unlike using woods to make a fire is so unclean because of dirt from the coal it produces.
If you buy my gig I will teach you step by step how to do it.
But if you want the finished product you must pay the shipping cost for it.
So what are you waiting for, I am not giving the tutorials how to do it.