Answer:
What type of shoes do spies wear?
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
In the sun I like to play; in the rain I goes away; walk or run I always follow; in the mud I always wallow.
I am a shiny metal sheet that covers BBQ food.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.