Answer:
Where do you go in through one hole and come out through two holes at the same time?
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.
What can answer in any language? What can speak without a mouth? What can sing without an ear?
What goes in the water black and comes out red?
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.