My proposal below for different rulesets depending on how much of a challenge you want.

Hard mode: Only the very basics

Water, table salt, neutral cooking oil, white sugar, white vinegar

Normal mode: Non-perishables only

Dried stuff (beans, white rice, pasta, mushrooms, flour, starches), honey, spirits

Includes the very basics.

Normal mode: Staples only (perishable or non-perishable)

There may be certain items that you would purchase with most grocery trips to ensure you always have some on hand. Only consider sets of items that are very cheap where you're located (or at least, somewhere on earth). As an example, I might include milk, eggs, garlic, and onion. List the ingredients that you consider to be staples.

Includes the very basics

Easy mode

Just come up with something tasty that includes the required ingredients.