Answer:
You get many of me, but never enough. After the last one, your life soon will snuff. You may have one of me but one day a year, When the last one is gone, your life disappears.
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
A hill full, a hole full, yet you cannot catch a bowl full.
My thunder comes before the lightning. My lightning comes before the clouds. My rain dries all the land it touches.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.