Minecraft wiki entry for Furniture, associated text: A sink allows you to have a water supply right in your kitchen. Many sinks use a 2×2 square. You could also create a 1×1 block sink just for show, or a flowing sink. You can use a cauldron filled with water (or alternatively a hopper) and then, a lever (or tripwire hook) above it representing the tap. Putting iron blocks below or surrounding your sink would look cool, or gold or diamond blocks if you have the resources.