I live near Canada (northern NY) so this is something I have to plan for --

My plan includes two milspec poncho liners, small backpack of warm clothing, water, datrex survival bars, various PSK signaling devices, tea candles, and a trangia alcohol stove to heat warm drinks. I should probably add a couple of sleeping bags, but haven't yet.

My understanding is that an alcohol stove does not produce carbon monoxide (which would include the survival heater referenced above). However, I think you would still need ventilation.

Interested in responses: does burning alcohol produce CO?

Above all, I would avoid making things really complicated and relying solely on some mechanical/electrical device that would probably fail just when you need it.

Tim