This is that home made soup can stove I was referring to in a earlier post.
Just as I said before put a BBQ briquette inside and light (I use the easylight ones) let it go to a coal and put your cookpot on top. Maybe have to brace the sides with soil or rocks. Re-usable over and over. I carry the extra briquettes in a Ziploc bag. And the cooled of stove in another to keep it from blackening my other gear.
Add another briquete if the other one starts cooling off.