Answer:
I stink up your breath and fights evil vampires
If you're looking for something sweet I know what to do. But if you don't like heat I'm not for you.
I go up, let out a load and then go back down. What am I?
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 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?
Give it food and it will live, give it water and it will die.