The best investment is to reduce the energy need b heavily insulating at least one small room. Also use emergency tents to pad your walls. Worst case scenario you build a tent in the house,they get cheap in the winter. Superisulate that tent,u can stay warm from the heat of your body. About cookiny,cane sure you have a large thermos. This is the lowest energy intrnsiv method i found in preparing your food: put your ingredients in the thermos, fill it with boiling water,seal and wait for 3-4 hours. No smell no smoke,using camping alcohool stove.