Answer:
What four letters frighten a thief?
What do you call a fish without an eye?
What can you never have for breakfast?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
When life gives you these, make a refreshing beverage.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.