There are many ways to re-use stuff in the kitchen. If you don’t know many, talk to your grandmother 🙂
One basic idea is to replace disposables with re-usables.
Paper towels: use cloths, rags (especially re-used worn out clothing like t-shirts), newspapers
Saran Wrap: use long-lived food storage boxes (Tupperware etc), and glass containers to store food, elasticized plastic “shower-cap” type lids to cover containers (they can be washed and reused multiple times), scraps of washed and reused poly bags if you need to lay plastic directly on top of a food to keep out air.
Aluminum foil: as above for food storage uses. Foil can be washed and re-used itself when you really must use it as in covering something in the oven (although consider using a lidded cooking container instead!)
Disposable plates, cups, flatware etc: obviously, use regular dishes and flatware instead and wash them.
More ideas? Add them in the comments!