Answer:
I occur twice in eternity. And I'm always within sight.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
Many foods can make me strong but give me water and I won't last long.
Doing something of this nature is likely to land you in court
The profession of Jimi Hendrix and Eric Clapton
My days are numbered.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?