Answer:
I am Invisible Man's drink at snack time
I went into the woods and got it. I sat down to seek it. I brought it home with me because I couldn’t find it. What is it?
What is black when you buy it red when you use it and gray when you throw it away?
A large oasis in the desert. Come with cash and leave with none. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.