For those considering the purchase of winter tires, a good web site with demonstrations comparing the performance of different vehicle types (including all wheel drive) with and without these tires from the Rubber Association of Canada.
Survival experts have also advised against consuming snow as a water source. Les Stroud, a Canadian survival expert, has demonstrated that if engaged in physical activity, such as walking, the consumption of snow when necessary is safe as metabolic heat offsets the cold snow. Some have survived in Arctic conditions doing this. However, it is still not safe when hunkered down.
Best Regards, - S.R.