Your cold weather survival gear should include:

A mosquito head net. Often refered to as a barrier net.

A few feet of cord.

A Metal mug or container.

A ferrocenium rod (Best cold weather firelighter).

A 1 litre or bigger thermos flask (minimum, 2 or more is better).

Light your fire. Pack snow into the head net. Hang the head net near to but not over the fire. Position the mug under it to catch the melt. When the mug is full, place closer to the fire to warm it. Boil it if you wish. Pour into flask. Repeat as required.

This will take longer than most people expect. Snow is 90% air and is a good insulator. Which means that it does not melt easily.

You should also carry a plastic mug or cup to drink from. One of the insulated ones for choice. Metal freezes to you below certain temperatures. Which will cause a cold injury.