Answer:
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
I am rubber you can eat!
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
If I drink, I die. If I eat, I am fine. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.