bird feeders made from plastic bottles

Pleas! Does anyone know how to make a home made humming bird feeder from a plastic bottle cokacola??

Screw-in bases are sold at many stores that sell bird feeders. A real bird supply store such as Wild Birds Unlimited is the most likely place. They usually run $ 4-8. Keep clean the bottle is very important. I often like to change the bottle or use a good bottle brush.