I just read an interesting article on Be Prepared To Survive about using aluminum foil as an improvised water container.
http://www.bepreparedtosurvive.com/Don't%20Trust%20Aluminum%20Foil.htmThey even call out the PSP:
We even tried the heavy duty aluminum foil provided in the Adventure Medical Kits "Pocket Survival Pak" (the package indicates the heavy duty aluminum foil can be used to form a container to boil water). None of them held water.
Has anyone experienced/tried this?