Answer:
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
What is it something that you always have but you always leave behind?
Give it food and it will live, give it water and it will die.
What is it that given one, you’ll have either two or none?
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
I can only be played on a windy day