The nice thing about this plan, you are working from foods that you already eat. And you learn quickly what foods you actually eat.
DH does a lot of cooking & purchasing of food. Initially, that meant DH's instant flavored potatoes in a bag, spice packages, canned veggies & fruits.
For us it included mayo, peanut butter, tuna, relish a lot of our go to foods when we didn't want to cook.
This also applies to personal care items. Actually this is the first area I started. Because I started my preparations by making a lists of everything I used from the time I got up & utilizing the principle of use one, buy two; I now have about two years worth of these various items.
More information on how I started: (In the Beginning...)