Answer:
It's like food but water kills it. What is it?
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
What is as big as you are and yet does not weight anything?
A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?
What is that over the head and under the hat?
I have two bodies joined together as one. When standing still I run and run.