Paul810, I just noticed on there FAQ http://www.guyotdesigns.com/site/htm/bottles_faq.html

Are the bottles insulated?
Our double wall bottles will insulate your hot or cold beverage very well.

If this is the case, then a fire would be out of the question and this thing would be useless, hence the search continues....
I may try to e-mail them and see if they have a non insulated version and see if I can get any specs.