Answer:
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 you catch but not throw?
What has a big mouth, yet never speaks?
What kind of table has no legs?
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?