Answer:
A device for finding furniture in the dark.
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.
I'm flat. You use me everyday. You need me to live. But you give me away everyday. I'm coloured and I have a founding father on me. What am I?
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
Inside a great blue castle lives a shy young maid. She blushes in the morning and comes not out at night.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.