Thick wool blankets, polypropylene underwear, thick wool socks, and a toque. Go get a large emergency Candle, or Large Bees Wax Candle, they will keep you from freezing in the winter. Under your bed, from the bottom up this will work; layer of newspapers, layer or two of corrugated cardboard, then the foamy or mattress. Alternate, thick felt then wool, then bedding. <div><br></div><div>Keep your area you need to heat small, making a smaller tent like area inside your vehicle is very important. Also face into the rising sun, that way passive solar gain. Heating the water in the bottles is a great idea, and some ventilation as well, very important! Do not close it even if you feel cold, waking up as mentioned is very important as well.</div><div><br></div><div>If you can not afford the heater, borrow money soon, get one. There are some smaller kerosene heaters that will keep you toasty all night as well. My space is too big, the kerosene would cost just a fortune to keep it running, propane is a better option. The little propane heater must have a kill switch built in, low oxygen and tip over safety features, if they do not have those, do not buy it! Catalytic is the way to go they are more efficient and safe as well. Can you plug in somewhere overnight, then a small ceramic or oil filled heater will keep you toasty as well.</div><div><br></div><div>Use the search feature, there are lots of threads on heat, keeping warm in the winter in your vehicle, van, car or truck.</div><div><br></div><div>There are also some Aladdin and related space heaters, they run on Coleman White gas, some on Kerosene some on diesel. Hope this helps. Prices New range from $80 and up, used sometimes as low as $40 and up. I bought two kerosene heaters for only $40, then a much better brand new in box one for $40, the only drawback is how big it is. Kerosene here is $25 for 2 gall, 4,9 ltrs, so it is very costly to keep it running. Use it only at night.</div>