There are certain staples both of us have, while other stuff he and I individually have, because the other person just isn't interested in having the stuff regularily.
Nearly every week to have on hand:
freshly baked bread, rice, oranges, lemon, 1-2 fresh herb bunches per wk. (basil, dill, thyme or mint), parsley, 3-4 different veggies per week (whatever is in season/on sale, usually 1 Chinese veggie plus whatever else), mushrooms, ginger root, white onion, green onion, garlic, fruits (1-3 types weekly), then in additional we each have strong preferences), egg whites, small amount of meat (1 type: seafood or chicken breast), pasta (eggless or Asian dried noodles. I no longer buy Italian styled dried. But love freshly made Italian as an indulgence.), raisins.
Him: plain low-fat yogurt, carrots, apples, bananas (I eat latter 3, but not as much), sunflower seeds, walnuts
Me: skim milk, oatmeal, tea, grapefruit/pears.
These are staples after all, not the indulgences 2-3 times per month ie. goat cheese. But we don't buy butter, peanut butter, chips, sugar, jam, etc. for home. We rarely buy dried beans.
We have our cookies, chips, desserts, etc. at cafes, other people's homes, restaurants.
We would actually find things very dull if we didn't have: fresh ginger root, onions and garlic on hand at all times. Plus safflower cooking oil, chili paste and reduced sodium soy sauce on hand all times.