with a tiny snopeak stove and one cannister ,(few ounces) and a little food (bars...) you could last easily a week as long you dont get too wet and its above -30 outside. when you melt snow, you warm your cave and body and dry a little .keep the bottle in your pants.dont waste . a bivy,big shell,would help to save heat.
I MEAN YOU WILL SURVIVE, NOT VACATION.....