I buy seasonal veg as well as topping up garlic, onions, and celery as needed, and only buy apples, bananas, and oranges or clementines fresh. All other fruits I buy are frozen. Berries go off/ soft too quickly, and I mainly use them to bake or in smoothies anyway, so frozen work very well. I also buy tinned tomatoes and tinned beans.
This week's veg shop was carrots, green cabbage, one large potato, and onions. I've had carrot and apple salad twice, and will make coleslaw using a vinaigrette (no mayo) tonight that should last two days. The potato will go into a lentil and veg soup on Saturday. I plan to make a jar of pickled onion, cabbage, and carrot for the odd snack.
I eat very little meat and tend to use it in chili, curry, stews, and other casseroles, so it's mixed with beans or veg. I like sardines and splurge on a brand that runs expensive, but still cheaper than buying fresh. I have half of a smoked mackerel in the freezer that I plan to use next week. Also some fresh tuna that will make a nice salade Nicoise the following week (need to buy potatoes). There's a chicken breast on the bone that I'll use in a chicken, smoked sausage, rice, and black bean dish that I make. I need to buy the sausage for that.
I usually buy cheese weekly, and flour, as I make my own bread. Also butter or butter/ oil spread. I hardly ever buy wine or beer. I do buy fizzy water though.
I shop around. I'm in the US so I go to Walmart for frozen fruit, dishwasher tabs, catfood and cat litter, dried herbs, plain Greek yogurt, shampoo and toiletries, and then Aldi for fizzy water, tinned food, frozen veg, tortillas, butter, milk, and cheese. For meats and fresh veg and the occasional 10lb bag of rice I go to a few larger supermarkets, especially one that always has a sale on some brand of pasta. For dried beans/ lentils I go to the bulk bins at Whole Foods. My bill comes to around $40 - $50 per week for two adults. It would be higher if I bought wine or snacks/ crackers/ chocolate. Also, shopping around saves money. Aldi is significantly cheaper than anywhere else for the items I buy there.