Have a trip in April at about 14,500' for two weeks for a project in Peru. Temps will be relatively mild at mid 30's to high 50's. I need something fast, light, and it only needs to boil water, no cooking. I like isobutane stoves the most but not sure if the altitude will cause issues, pretty sure it will not be cold enough to bother the isobutane, but I do not have any experience for longer periods at this altitude so any advise will be appreciated. Once again, just need to boil water and I/2 liter at most and it needs to pack small.