Answer:
I am used when you jump off a bridge for fun.
I am owned by the poor the rich does not need me. If you eat me you will die!
I'm a god a planet and a measurer of heat. Who am I?
I am in the middle of water but am not an island.
I have a brother. However much we run we do not reach each other.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?