I am going to hit up Nursemike for any extra chow. What he is carrying are a lot of my favorite things, and I am a regular Costco patron for much the same reason. If you refresh your supplies regularly, you will be fine. If you don't, I would recommend well packaged energy bars like Clif, in tasty flavors augmented by my favorite- Tanka bars, which are essentially pemmican - buffalo and cranberries. They more closely resemble real food than the usual survival items and, in my experience, they keep well beyond their expiry date.

Don't forget the tea bags!

Is it intended that this kit will be backpacked? If so, light,high energy foods make sense. If it is for car evacuation or shelter in place, get lots of canned goods. The water they contain will be extremely useful. Canned stuff stores well, and is cheap.