I studied the underlying subject a LOT on the run-up to Y2K (Yep, I was one of THEM). Given the scenario being described, take whatever you can lay hands on. A lot will depend on what you plan to do next. If you are on a leather-borne E&E, then don't bother with food that must be extensively cooked, like dried beans and rice, which the DEAD OPPOSITE of what make sense to store well in advance of need in a fixed retreat.
If you are di-di'ing, then load up on water (but not more than you can carry) and something like trail mix, raisins, nuts and other high calorie-to-weight stuff. If you are stocking your hidey-hole, then other foods make sense, like oatmeal, dried beans, rice, ramen noodles, bullion (Note: Bullion does a great job of flavoring what would be almost inedibly bland, or tainted by the taste of the water), salt, pepper and other non-perishable stuff. Keep in mind that you may have guests at the residence (remember Preacherman's story?) and stock way more than your immediate needs. It's cheap insurance.
Regarding storage food, don't go too far astray from what you're already accustomed to eating. Rice, beans and peas, pastas are familiar to most of us. Bulgher (sp?), cracked wheat cereals, and much of what is commonly sold as storage food might not be adopted under austere and stressful circumstances. Not to be crude, but it might tax the available sanitary systems. If you plan to store these, learn to cook, eat, and enjoy them BEFORE you bet your life on them.
Again, to address the premise: Don't be that guy. It's too cheap, and too easily available prior to the emergency, to put this off. Just the opposite is true after TSHTF. Just be sure to have some of the bug-out chow ready to go. You don't want to go scrounging thru the pantry while the water is literally rising around your ankles.