Do not forget the USCG ( Coast Guard) Survival bars. Not only are they Yummy they are designed to keep you alive in really really bad weather. and do not forget seal oil or in the case of those who do not have an Inuit or yup'ik connection Bear fat.

You can get bear fat for free. Ask at the local game processors for it. Many people do not keep it.

The purpose for those is your personal survival kit. Not any warm thing will work when it comes to Hypothermia. Yo need massive amounts of Highly digestible nutrients that generate heat when digested. Please see my article posted in the training in adverse weather topic by SBL