Answer:
I know a word of letters three, add two and less there will be.
What is broken if you say its name?
What is so delicate that saying its name breaks it?
What can be white and yellow at the same time?
Sally, Lisa, and Bernadette are triplets. But Sally and Lisa share something that Bernandette does not. What is it?
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.