Answer:
I can be sweet or sour. I do not rhyme with any other word
I am the ultimate killing machine used not once but TWICE I can be made by humans.
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?
When I am caught I am thrown away. When I escape you itch all day.
I flow from the Homerβs mouth when he sees doughnuts.