Prepper
A person who is prepared, or striving to be prepared for incident, natural disaster, etc

A person actively preparing or being prepared for situations that may affect the stability of home, life, or financial situation.

Also known as survivalists, doomsday preppers (derogatory)
Jim and his wife have canned a lot of food this summer. They will be prepared this winter!

Carrie is a good prepper. She has a 72 hour bag for each of her family members.