Answer:
I am very easy to get into,but it is hard to get out of me. What am I?
When you take away the whole from me there is always some left.
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
The more holes you cover the lower I go.
If I drink, I die. If I eat, I am fine. What am I?
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.