There are a number of things you can do to help this. If your fuel bottles are small, you may want to keep them in a pocket of your jacket. Duct taping a hand warmer around the bottle can help. In extreme conditions putting your bottle in water will help keep it warm. In an emergency situation when temperatures are bitter cold, even packing it in snow is better than the ambient air.
Warm fuel burns more efficiently.
Don t place your stove on frozen ground or on the snow. As the stove runs it will melt the ground or snow around it, causing your stove to possibly tip over, dumping your meal. Put your stove on a metal or durable surface like a rock or an unused lid of your cookware set. Bring your cookware with you when you buy your stove. When you buy your stove bring your cookware with you.