@hupto Grow stuff - but hear me out. Only bother with the easy-to-grow things that are expensive in the supermarket. Salad greens of all kinds are like $4/bag which makes 1-2 salads (depending on the size of your household), but are quick, easy and non demanding to grow. Herbs are pretty easy and you get a lot of flavour bang for your buck. Rosemary, once established, will truck along for ever. You can do herbs in pots if you need to (don't even need to buy pots - use 1l yoghurt containers or whatever with a couple of holes in the bottom) and don't require top notch soil. Most herbs can be started from cuttings, just Google or YouTube it. IMO every house should have a lemon tree; in a large pot if you're renting. You should compost your food waste for lots of reasons but def if growing things.
Skip broccoli, cabbage, corn, potatoes - all that bulky stuff that takes ages and has lots of stages (= opportunities for things to go wrong). Tomatoes are a maybe, maybe not thing depending on what you've already got set up. Don't grow things if you have to buy lots of supplies (bags of compost, raised beds, tools) because you'll never make your money back.
Remember, when you grow your own you'll be harvesting it when the produce is at it's cheapest in the supermarket, since it's in season. So be selective.
You can buy whole ears of corn when they are super cheap and biff them in the freezer (if you have space). You can just microwave them when you want to eat them.
Some towns have a community orchard you can go pick basic fruit at.