Take the large, clean plastic milk or juice bottle and cut off the base. Remove the lid. See the image for more details.
Tie string or twine to the edges of the cut end of the bottle for hanging. Punch out the holes using a hole puncher, or use a sharp tool to insert holes through which the string can pass. Knot the string in place with loops to attach to the hangers you've made. While the image shown later in this tutorial shows two holes, you may find three holes produces a better balance––experiment to see what works best.