Riddle #546

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

What am I?

Question: What can be broken but never forgotten?

Question: What tastes better than it smells?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

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?