First, we need to buy supplies for the windmill: a wooden stake, a hammer, a plastic water bottle, and a drill and 3 nails. Then, we need to cut off the bottom of the water bottle. Next, you cut off the bumps on the bottom of the water bottle, which makes the blades. Then, you drill a hole in the middle of the blade. After that, you cut a piece of plastic off a water bottle. You nail the piece of plastic onto the stake, and then nail the blade to the piece of plastic.