The use of "Elemental" container as a cook pot is viable one, since I know of at least one resourceful lad (pastprimitive.com) who sells them unridged , as pots and seems to be doing fine..
I did try to put ridges in the original aluminum containers that I get from -
newdirectionsaromatics.ca .. and did not have too much success.
Even after annealing the can, I was not able to put even, consistently deep, ridges into the sides of that can, no matter what I did; I pressed and grunted and called on the metal gods (mostly "Zeppelin" and "Motorhead") for assistance... to no avail..
I seem to remember seeing one of the "Elemental" containers in a hospital once..
(I think they use them for sending sealed plastic jars of "Bio-material" out
for testing, Stool samples and such...), and at that time it seemed that the aluminum was not as much "rolled" into existence as much "Hot" pressed like the "aromatics" cans which might make them just as hard to ridge...
Worth a try though...
Regardless a little more detail on the lids of the Fosters ridged cans I made, might clear the air on how they seal in the liquid..
In the following pic:
The "aromatics" container is on top, with original lid screwed on, (a "Minibulldesign"
beercan lid sits to the right for "scale"), lower left is the cut-off threads (top of aluminum container) sitting on top of Minibulldesign" beer-can ring (I usually use my diy rings, but for these pics his rings are just so much prettier..), bottom right is a top view of screw on cap , which after the center is cut out, will become the "screw" band to keep cut-off can bottom, in place, as lid for the whole unit..
The beercan-ring gets pressed into the cut-off threaded top of can and its edge is rolled over the bottom in a way as to seal it between the beercan and the beercan-ring , preventing it from ever coming out.. after that the whole she-bang is pushed into the fosters can and T H E N the ridges are rolled in, otherwise the can might collapse accordion style .(Yeah, I have learned that lesson over and over..)
Next pic , the "screw band" beside the upside down "aromatics" container bottom , which is now the lid , which can be held in place by the "screw band" for liquids transport..
(you can see the bead of thinned silicone I applied to the outside edge of lid which does the sealing)
Hope this makes things clearer , as I am not sure the same functionality (never mind the expense of anodizing the insides) can be gotten from the "Freund" container cook pot. ("Freund" is another supplier of the "elemental" style containers.