>>617418Oh man, first of all, this is def not what I would recommend. I've had to do it like 3 times over the course of my life because I/someone else fucked up and didn't bring something or broke something or whatever. Point is it was always improvised.
First time I tried:
Made a shitty stove like object out of large flat stones and mud, with an approximately horizontally-laid-nalgene-sized opening. Transferred hot coals from larger fire into nalgene stove. Placed nalgene at like 40% full (had to lay on it's side with top open, but it's a narrow mouth so it still holds almost half it's volume when on it's side) in the opening. Carefully watched and rolled the bottle to try for even heat distribution. It worked. It took like a fucking hour of constant attention, but it worked.
2nd time:
Had a little folding-leg grill with me. Built a makeshift chimney like thing with grill in it. I placed a flat stone on the grill, then put the nalgene on the stone. Put coals under grill, cover top, wait. Boiled much faster but was much more worrying as I thought it might be too hot. But it wasn't . . . so it worked out. I was kind of imagining a jetboil system when I was building it.
3rd time:
Had a steel pot with water. Filled nalgene with water and placed in the water pot, boiled water in both of them.
If you're thinking this doesn't make any sense/is pointless, you're correct. My party of adventurers were all high/drunk at the time, and it seemed like a cool experiment since it was after dark and camp was all set and we were all bored with nothing to do but sit around and drink/smoke.
don't ask me what temp a nalgene begins to melt at. I have no idea.Would only recommend as a last resort because it's a pain in the ass and you risk losing a very valuable container. The key is to keep direct heat off the bottle and not use open flame as that is a much less stable temp. Just bring a steel pot or a water filter.
