Water is a compund of 1 hydrogen atom and 2 oxygen atoms. water was just the name given to it.
Think about it, 16 years old? You become a adult when you turn 18. You would also have to be more responsible because 18 is the age you're actions have huge consequences. If you're 16 the worst that could happen is that you get grounded!
In greek methology, one famously unable to resist tempation is the guy named Tityus. Tityus is a giant and was the one who assaulted the goddess Leto when she was traveling to the shrine of Delphoi. Tityus was slain by the son of Leto.
To establish a sense of curiosity, to get them to read more