What if we have a New Madrid earthquake and it downs bridges, and pipelines supplying the north east? What might happen. No grain from the plains states for bread unless shipped far north or far south around it. Supplies of food could be limited and/or more costly.
What if we have the overdue solar flare that knocks out power, phones, cell phones, and half the vehicles in America. Again food would be in short supply.
The guy in New Orleans probably should have had a couple of water filters for fresh water since they could have filtered the river flood water for potable water. Yes, water might be in short supply, but if you have a creek, or other means of supply. On the "Doomsday Preppers" show, they had water bags, that you place in a tub and fill from the tub before the water gets turned off. Can store about 200 gallons that way. If you have multiple tubs, more water. These bags are used a lot in Florida for water storage before a hurricane hits. With a good water supply and/or a good filtration system, and enough food, the guy could have lasted months. One must think of every senario and plan for it.
I don't think you need a 25 year supply of food, but a year, maybe two. Canned goods and frozen foods can last 2 years. I just ate some vacuum sealed deerburger that was 3 years old, and it was still good and red.
Diesel fuel can store for about 10 years. Gasoline about 2 without Staybil. A small diesel generator would be nice with enough fuel to run it about 4 hours a day for quite a while, just enough to keep refrigerators and freezers working. If not a small (minimum size) 8,000 watt generator can carge a freezer and refrigerator and run a 240 v airconditioner if needed, not at the same time. Gasoline can be stored in 55gallon drums, but it needs to be rotated. Diesel is easier. Kerosene is even easier, much longer lasting, like 25 years.
Any dry goods can store in a cool dry place, sealed, for years. Canned goods for about 2 years, unless it is sweet. Smoked cured hams can store for a long time withou refrigeration. $20 extra each time you get paid can go a long ways for prepping.
Guns, ammo, toilet paper, can store indefinately. Toilet paper will always be needed.
I believe we will have an economic colapse caused by hyper inflation from excessive government spending within about 5 years, especially if Obama stays in office. This may cause panic, especially in the cities, that may spew out into the suburbs and countryside. Martial law might be imposed. Confiscation of guns and food by government might be in order, so keep it low key, especially around neighbors, or move to the country.