My ultimate goal is to have one year minimum for my family of 5. But I'm starting to build that by using shelf-stable stuff like this that lasts like 25 years...
Buckets of Food Pouches - TruPrep Emergency Preparedness
Now, I'm not preparing for doomsday, my thinking behind it is (God forbid) if some disaster happens, we could be completely self-sufficient for weeks or months if necessary. If I have enough food to feed my family for a year, I would have food to spare to help my neighbors during that same crisis period. I've got a metric-shit ton of bottled water, because I can store that in the garage.
Edit: Grow coral? Is there money in that?