Riddle #546

Question: I'm not a pool, a tree, a slave, a website, or a shirt.

What am I?

Question: My thickness is no more than a few centimeters, yet my depth can span to infinity. Although mundane, I intimidate most animals. When in my presence, you will inevitably follow me. What am I?

Question: Some people peel my skin some people don't, you eat me nevertheless, with or without, what am I?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What loses its head in the morning and gets it back at night?