Answer:
My first is a body of water. My second is me. My third came before. My fourth before all three. My fifth sounds like my first. My sixth is in a lake. Put all six together to make an animal that will keep you awake.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
I'm not really more than holes tied to more holes. I'm strong as good steel, though not as stiff as a pole.
Who works when he plays and plays when he works?
Do what he says and you'll be fine, don't and you lose the game.
What is always coming but never arrives?