Vampire Lota Vase
This is the very famous Lota Vase Trick.
Great prop! Pour a quantity of water from the vase, seeming to empty it. A few minutes later, again pour a quantity of water from the container, apparently emptying it. But no! A few minutes later, you again pour water from the vase! Endless possibilities.
You can realistically expect to get 10-12 good "pours" from this Lota Vase.