Hack a Toilet for free water.

Step 4 Making the sink

With a marker extend the line on the funnel so that it goes all the way around, cut on the line with an Exacto knife. Now take the metal bowl and create drain holes in the center with a small drill bit, making sure the final drain is no bigger than the top of the freshly cut funnel. Next place the funnel on the bottom of the metal bowl and apply liberal amounts of caulking glue on the crack between the bowl and funnel.