I regularly carry a Wiggy's SS water bottle. Have boiled water in it - works well - hot as H*ll!! Use gloves, big socks or mitts. Before I've just dropped it into a double wool sock "rig" and all is well! This thing is built like a tank - except for the little dongle welded to the top of the lid for the chain - I replaced with a SS bolt - no prob. I also replaced the chain with more substantial SS "clock" chain. It uses a humongous o-ring for the lid seal - don't boil with that turned down or you have a bomb! It fits into standard Nalgene spaces and cups integrate to the bottom diameter. Heavy as lead but thoroughly dependable. Would recommend.

BTW, I cannot conceive of an insulated bottle that you would boil in - a scientific oxymoron!