Survival Kits can be made from several different things and for many different reasons. Deciding on what is needed to complete a Survival Kit vary for even more reasons and situations.
Radiation is all around us. It's a natural occurrence as the Earth is heated from the sun. Radioactive isotopes have also been found in rain water in Minnesota and other states.
"Survival of the fittest." is an old phrase used to describe those people who are strongest and likely able to survive any situation. Today it's more accurate to say "Survival of the best prepared."
Going camping in cold weather is not for everyone. Only people who know what they are doing should attempt it.