I don't think anyone would dispute that. Certainly I did not intend to do so with my comment. I personally have a stock of about thirty days of non-perishable biscuit that can be used to supply calories in an emergency, and a forty gallon canister that could be filled with potable water ahead of a disaster. It's not enough to live on independent of civilization for more than a few weeks, but if more than that is needed we are probably screwed anyway.