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: Make a pool for the kids
Put a large tractor tire in the back yard and put a pool liner inside it. fill with water.
Dig a shallow area in the backyard and fill it with water. Add a small slide and some water toys.