Answer:
I mirror your actions.
I save lives on the ground and in the air
The more it dries the wetter it gets. What is it?
I have no weight but I could destroy a mansion. What am I?
I have no wallet but I pay my way. I travel the world but in a corner I stay. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.