Tea leaves, bags and coffee grounds
Just read up on the subject:
Use tea bags to cover the drainage holes in containers. They hold the soil in while allowing the excess water to drain.
Coffee grounds
Don't worry about the acidity of coffee affecting the soil's pH. Studies have shown that as the coffee decomposes, the pH neutralizes. A bigger concern is what happens when you apply a very thick layer of coffee on top of the soil, about 2 inches or more. As the coffee dries, it forms a crusty shell that does not allow water to pass through. Use your coffee grounds sparingly. Put the excess in the compost.