How do you save money at the supermarket?

[Backseat Driver]

59. There's only two of us in our 70s - I buy a $5 rotisserie chicken at Sams.

Day 1 - Legs and wings - 2 pieces ea/one meal
Day 2 - Slices or diced breast/pot pie - broth for extra flavor/carrots, celery, onion all fresh and easy crust - eat or freeze
Days 3 and maybe 4 - Pick the bones and make chicken noodle or rice soup

Same routine with frozen pork butts, half a loin, or sale ham or beef roast and soups from the leftovers using different veggies - you can also make mini meatballs, use frozen peas, broccoli, mushrooms, barley, wild rice. Admittedly this is easier in the colder months when I can use the oven for roasting more often and the garage as a fridge. We often use various flavored sausages and fix breakfast for dinner w/Bisquick items, pancakes, waffles, quiches - I do like Kodiak hotcake mixes or casserole/bowl meals like chili, chowders, French onion soup, veggie beef, all beef hot dogs and beans, or potato and cabbage soups or haluski. I have a breadmaker and InstaPot. I've been known to make Boston Brown bread as in the cans (molasses and raisins) from scratch with cream cheese with hot dogs and beans. YUM! We eat more cold cut sandwiches with homemade potato salad or slaw in the summertime, (fried bologna is a favorite) since our complex won't let us grill - it's a liability thing, I guess. LOL, we can always mooch at our kids' house; SIL is a great chef.

I make my own daily beverage once a week - green iced tea with lemon juice from the bottle (or herbal teas) and sugar.
Long ago, those came in glass bottles with screw lids and I've recycled them for at least 2 years.

Of course, your dietary requirements, restrictions, or allergies need be followed and that might increase your prices.