Do you have any ability to get a kerosene heater? Or a generator? If you can go into survival mode, and pack towels and blankets around and over the doors and windows, and get a heater safely installed with safe exhaust ducting, you can probably keep yourself going. When our furnace died completely this January and it was 0F outside, we managed to heat the house to 69F with about 10kW worth of electric heaters. Now I know you have no electrics, but I’m saying that if you can get at least a 30,000 Btu/hr kerosene heater, you can probably do the same and keep on going.