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.
I'm not really more than holes tied to more holes. I'm strong as good steel, though not as stiff as a pole.
I'm very tempting, so its said, I have a shiny coat of red, and my flesh is white beneath. I smell so sweet, taste good to eat, and help to guard your teeth.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
What has a bell but isn't a church. Is full of air but is not a balloon?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?