Answer:
What liquid can contain the soul?
My head bobs lazily in the sun. You think I'm cute. For my face is yellow my hair is white and my body is green.
What can be swallowed, but can swallow you?
What has four legs during the day; and six or eight during the night?
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 am owned by Old McDonald.