Even FEMA and Homeland Security have told us to be able to take care of ourselves for 3 days.
From the Department of Homeland Security:
http://www.ready.gov/america/_downloads/trifold_brochure.pdf
We’ve seen over and over how communities suffer because people don’t prepare. A few years ago, I was invited to Thanksgiving dinner at friends house. They have NO extra provisions....I couldn’t make gravy because they didn’t keep flour. They shop for every meal. I’m afraid that’s the rule rather than the exception.