Keep the fire going for a while and the bricks get very warm and make a good heater. In a tipi or wide area under canvas, this would work well at providing a cooking fire and a source of slowly released radiant heat.
An easy to make denatured alcohol stove. Denatured alcohol is sold in the paint thinner section of a hardware store. YouTube has a lot of videos on how to make the stove from two aluminum soft drink cans and a larger metal can. And you'll need a penny or metal slug knock out.
Better video showing how to make an alcohol stove and using a fuel additive called Heet.
