Answer:
What measures out time. Until in time all is smashed to it?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard.
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.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.