Answer:
What can be swallowed, but can swallow you?
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.
My thunder comes before the lightning. My lightning comes before the clouds. My rain dries all the land it touches.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
Bright as diamonds, Loud as thunder, Never still, A thing of wonder.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?