Hoenstly, I have no idea who this man is, and how he would be in possesion of such knowledge.
I do not overly worry about that which i cannot control.
That being said, i think it is wise to have a month or more of food supplies and other essential things. Not just for terrorist actions, but just think, "Katrina". (and for us this year the ice storm that had most of NH without power for one week to one month).
There are quite a few survival threads and stockpiling threads here, i suggest you do a search for a few.
But, just as how to do it...if you have the time, and an extra $5 to $10 a week, use that amount of money to buy things like tuna fish, peanut butter, dry beans, rice, nonfat dry milk, and paper plates and paper cups incase you have no running water for a time. and we store water in rinsed out milk jugs etc...
it is a lot easier to do all this if you have a place to store it all. Oh yes, and don't let the stuff just sit on your shelf for years and years, make sure that you use it and replace it so that if in 2015 say, we have a disaster happen, all your canned goods are not expired!;)
HTH