Answer:
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
A precious fluid, thicker than water.
Hold these between your knees if you want to set a Cuban beat.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
What do you fill with empty hands?
What did the piece of wood say when he saw the screwdriver and screws approaching?