I see 3 pages of replies and no one has yet mentioned... SEEDS!!!

Now, you wouldn't normally pack seeds in a survival kit, but we're talking about a 10 year survival situation here. No need for the last 9 years to be as rough as the first year. Start a garden! And don't get any fancy hybrids. They will not breed true. You need heirlooms. They will provide you with fresh seeds, equal to the parent plants, each year.

http://www.heirloomseeds.com