Fruit, foremost: Melon is top, followed by pears and cherries and whatever else isn't too terrifically high in sugar (ie: grapes).
Vegetables: I try to make one meal per day a nice, big salad, and my favorite base ingredient for this are these mini Napa cabbages. Then of course, we got carrots, cucumber, red grape tomatoes (also good for snacks), and whatever else looks good.
Grain/Staples: Oats, basically. I eat rice here and there, but it's hard to budget in a satisfying portion of white rice. Very rarely do I bring home bread. I let the fruit do my carbs for me. Oh, I love millet, but cooking it is a big pain, so I don't often buy it.
Protein: Almonds. So many almonds. They also sell these expensive "foolish chicken" eggs, which are free-rangers -- I eat those and avoid battery eggs. Dried fish, which is not pleasant to eat, but is basically nothing but its weight in pure protein.
Ancillaries: Vinegar (white rice), soy sauce, thousand island dressing, sesame oil, hot pepper flakes.
Drinks: Tea, bottled water, and of course, Diet Coke.
What I have to have: Tofu, eggs, vanilla soy milk, beans (preferably black + kidney), oatmeal, avocados, bananas, apples, Green tea, baby spinach or kale (whatever is on sale), tomatoes, any sort of berries (preferably blueberries), grapeseed oil
What I get additionally: Peppers, broccoli, edamame, pears, strawberries, watermelons, Greek yogurt, Lightlife veggie burgers
I always make sure I got my protein, veggies and fruits for every meal. Sales are always good and something I look out for.