There was a Survivorman episode where Les Stroud boiled water in a plastic bottle over an actively burning (not smoldering or coals) fire. I'm guessing it could be done although I would rather try with coals or hot rocks. However with all the current controversy about BPA and polyethylene I think I would not try it unless in real need. Heck, I don't even microwave with saran wrap anymore...
He also did it with a camelback bladder. As long as the part with the water is over the flame (mind you, he adjusted the height constantly so that the flame didn't lick the container), the water should withdraw enough heat from the plastic to avoid its melting.
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