I've made a lot of stoves and have not been that happy with the results of the fancy feast. A simple one that I like is the tomato burner (do a youtube search).

Tomorrow I was planning on putting together a DIY of the mini energy drink double walled stove. It's my new favorite and an excellent choice for most pots (because of the diameter) and a great choice for weight (9 grams).
Without a doubt, the hardest thing of all in a survival situation is to cook without the benefit of seasonings and flavourings. - Ray Mears