Sue,

I agree that a condom is not a practical water container. I watched Cody Lundin blow one up and tell us it was a good water container. Also Scott Kozakiewicz from ASU lists a condom for a water container. When pressed about it he said you have to spit the water into the condom. If you have tried adding water under a faucet you will see that just flowing water does not fill one up. I think a quart or gallon zip lock bag is much better. A Platypus bag is even better.

I am able to make a usable cooking cup out of an 36" x 36" square of HD aluminum foil. Like the one in the Ritter PSP. It needs to be folded twice so it is 4 layers thick. Then have about even bottom and sides and fold up the sides. Now roll the corners. It will not leak and will be stable. You now have a square cup like container that can be used to boil water. Give it a try!