Ok, tried this again with the Altoids tins as the bottom. Placed the tins with the aluminum foil cup in them directly on the coals. There were 3 tins prepared, one by me, one by my girlfriend, and one by my friend.<br><br>1. All 3 "foiled tins" managed to boil 8 ounces of water and make a soup with half a bullion cube.<br><br>2. I refilled them with 8 ounces of water and placed them on paper towel. Both mine and my girlfriend's leaked a few ounces, but my friend's held the 8 ounces for about 12 - 14 hours.<br><br> The problem was clearly in the AFoil cup design. My friend kept the foil smooth with just a few folds to acquire the desired shape, while our's was a bit...."crumpled" I guess. They could also have been damaged when the tin corner was grabbed with a multi-tool to get it out of the fire.<br><br> I'll keep testing and will try to get my hands on an Origami book as suggested.<br><br>Hope this helps, updates to come;<br><br>Guillermo Pico-Munoz<br><br>