A bushbuddy type stove may not be a bad idea for this, I can make one that is very lightweight and easy to carry. I like that idea. I filled mine all the way up, and since my bottle has never leaked on me, I didn't put it in a plastic bag. I also was wearing my polar fleece pants and smart wool socks, so the bottle never came in contact with my flesh. If contact to your flesh was a possability I would cover it some how.
Psalm 19:1-3 "The heavens declare the glory of God; and the firmament sheweth his handywork. Day unto day uttereth speech, and night unto night sheweth knowledge. There is no speech nor language, where their voice is not heard."