Food to buy to make a couple meals out of

Since I'd like to try avoid going to the grocery store often, as I'm pregnant, what food can I buy that'll make a couple meals out of it. For example I made a huge pot of chicken soup and with the boiled chicken I made chicken salad, hot chicken sandwiches and froze the rest. I have a roast beef which I'll make sandwiches with after. It is just me, hubby and a picky 5 year old. Thanks everyone

bon appetit