Answer:
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I am free the first time and the second time, but the third time is going to cost you money. What am I?
I am carried by mad animals.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. What am I?
What has a ring but no finger?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.