Answer:
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
A nut cracker up in a tree.
It's like food but water kills it. What is it?
What is the thing which, once poured out, cannot be gathered again?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.