I didn't like either option, so I decided to make my own copper pot.
Copper vessels can be found relatively cheaply online. Apparently there's a cocktail called a Moscow Mule which is served in a copper mug.
![Image](http://imgur.com/lJ974r6.jpg)
This mug cost just $15 and holds 22oz (650ml). That's a little small to cook in for my tastes, but not completely unworkable.
Of course, for campfire cooking, you need a lid. I bought a swatch of 24ga (0.5mm) copper to fashion into one. It's annoyingly expensive at $8--I'm sure you could find it cheaper.
![Image](http://imgur.com/Kh1oVH2.jpg)
It's very easy to cut with shears.
![Image](http://i.imgur.com/36yKAKg.jpg)
To shape the lid, I used a bit of unusual kit--a z-bender. It's designed to bend control surface rods for RC aircraft, but the upshot is that it can put two 90° angles into a piece of metal very precisely.
![Image](http://i.imgur.com/URkBn9V.jpg)
![Image](http://i.imgur.com/haxmQyA.jpg)
So there's a copper 'pot' suitable for boiling water on a campfire. However, copper is quite poisonous in anything more than trace doses, and a combination of heat and acid will dissolve copper and transfer it to your body quite readily. Therefore, copper cookware has to be lined with a non-reactive substance, most commonly tin.
I had a pound of tin lying around from...something, at some time. I forget. Anyway, plumbing solder would be a good bet if you don't have ready access to tin.
![Image](http://i.imgur.com/YbUTebF.jpg)
It turns out, melting tin and sloshing it around in your pot is not sufficient. It needs flux to bind the tin to the copper. The pros use sal amoniac, but all I had on hand was RadioShack electrical rosin...which worked just fine, actually.
IMPORTANT: The stove I'm doing this one is outside. No matter what flux you use, it smokes like Gandalf on a graveyard shift. If you do this, do it outside.
![Image](http://i.imgur.com/6xuhKWD.jpg)
Done! It's got a nice, even coating of tin on the inside of the pot and lid. And by "nice and even" I mean "lumpy and pitted". I used too much tin and it's hard to remove once in there, so it's kind of glopped onto the sides a bit.
Still, it'll work. A solo cookpot for boiling water or cooking stew or porridge.
The next steps will be removing the mug handle (probably) and installing a bail and lid handle.