Answer:
It makes me warm and secure.
A father's child, a mother's child, yet no one's son
Without what would everyone lose their head?
You can draw me, fire me or fill me in.
It speaks without a tongue, and listens without ears.
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.