I agree with PK: just a small tin will be enough to burn either solid fuel or alcohol. I made a burner from a Kiwi boot polish tin: packed a bit of insulation material from the loft inside it and popped some mesh over the top. Can use solid or liquid fuel, can pop it inside an Emberlit or under a GI canteen stove.

One thing to note though, be careful if you're intending to use these inside. Any burner will use your oxygen and pollute your air. Over here we get hexamine with our rations and it's poisonous stuff: must be used where there's plenty ventilation. Esbits aren't too dissimilar.