If in a car - Travel on main roads. Stay in the car. Occasionally run the engine to get warm. Run the engine 10 minutes every hour. Keep the tailpipe clear of ice and snow to provide ventilation and avoid carbon monoxide poisoning.
Mitigation is the key to survival in every natural hazard situation.
Preventative steps, such as car maintenance, insulating walls and attic, caulking and weather stripping, wrapping pipes, go a long way towards preventing an emergency or disaster condition. A little homework done now may go a long way later.