Your last good ping-pong ball fell down into a narrow metal pipe embedded in concrete one foot deep.
How can you get it out undamaged, if all the tools you have are your tennis racquet, your shoelaces, and your plastic water bottle, which won't fit into the pipe?
Drag your cursor between the asterisks for the answer
None of the random tools are going to help you. All you have to do is pour some water into the pipe so that the ball swims up on the surface.
And if you say that you don't have any water, then think about what you already drank today and if there's a way to (cough) reuse that.