Answer:
I'm the son of water but when I return to water I die. Who am I?
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
I am a king but also a common device of measure. What am I?
What is always coming every day, but never arrives until the next?
What's that 7 letter word with thousands of letters in it?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?