One way to cut down your expenses is by regrowing your food scraps at home. By saving and planting the seeds or the cut off ends of your vegetables, you can save up money plus it can provide your food sustainably. Most of the time, all you need is water and a shallow container to get it started.
If you have garlic cloves in the kitchen, multiply them by directly planting them in soil with full sun. Keep the soil moist, and wait for the bulbs to grow until you can cut the tall stalks that sprout from the bulbs and harvest them.
Carrot tops are usually disposed of, but if you regrow them, you can produce more carrots without having to spend for them.
Cut one inch off the top of the carrot. Stick a toothpick on it and balance it on top of a small glass filled with water. Make sure that the water is enough for the stump to be soaked in the water. Put the glass in a place with light but not direct sun. Refill the water until you see sprouting roots from the carrots. If roots have shown, you can now plant the carrot in the soil.
Submerge a chunk of ginger in water overnight. On each finger, make sure that there are growth buds. Chop the ginger so that you have one or two growth buds per piece. Plant it in soil with the growth buds pointing upwards or sidewards (avoid facing them down) and water them. When harvesting, dig up pieces of the roots and cut off what you need. They will continue to grow and can be harvested after a year.
Cut the bottom of the celery for about an inch and place it in a bowl while the cut side is facing up. Add water into the bowl enough to soak the bottom of the celery in water. Place it in a sunny area and water it until the leaves and roots start to grow. If it grows, you can plant it in soil and cut the leaves. In a few weeks, you will see the stalks grow again.
Take the leafy top of a pineapple, separate it from the body, and place it in water for two weeks until roots grow. Transplant it into the ground and wait for two to three years to make your first harvest.
There are fairly easy-to-grow crops that you can plant from scraps, though some of these will take years before you can get your first harvest. If you start now and continue doing it in the next few years, it will surely lessen your food expenses in the long run and will help you live sustainably.