Can't go wrong with cans, they last about 2-3 years(freshness wise, though I never tried), can be eaten cold, and usually contain 2-3 servings. The generic stuff from wal-mart is less expensive than most store sales and I figure I spend maybe $20 a month or so just buying a little extra here and there. It really does add up. Don't forget to include water for sanitary and hygiene purposes, even easier is baby wipes which can be had at costco for $20 per 1000 wipes. These are very handy for washing up quickly.
I know I said it before but I'll say it again, 72 hours of food and water does not apply to these islands!!! we are on our own, and i wouldn't expect us to be rescued by gov't efforts for at least 2 weeks. Look to Katrina for your example, it took our gov't weeks and weeks to get that place initially under control, and N.O. still has not fully recovered. Even during the tsunami scare, our state officials were unsure if they should shut down certain infrastructure or not, I guess when you have a bunker fully stocked in the side of a mountain its easy to have a 'wait and see' attitude. We(the people) just have to remember that these islands are supplied by the mainland on a weekly basis, and it would take weeks to gather and ship the supplies needed to get us stabilized after a major disaster. Now, in the meantime, wouldn't it be great if we had at least a months worth of food and water stored for our family so we didn't have to venture out into the hordes of the unprepared.