Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How do you make a Self-Watering Terrarium?
You can make a Self-Watering Terrarium out of a plastic tennis ball container. Don't throw away the top, and remove any stickers so sunlight can get in through the sides.
Add gravel, then soil, then plants, then a water reservoir at the base.