Answer:
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
It can be clear like water, but it burns like fire.
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.
What is something you can give away as many times you want without ever losing it?
The Black Pearl was this type of criminal seafaring vessel
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.