Check this out for an easy to build PVC well pump https://www.youtube.com/watch?v=PdUlyblmKhQ
I have made a couple of these and I really like them. They are Very Inexpensive. I am not sure how deep they will pump but I have pumped water easily from over 40 feet. It is very easy to add additional lengths of pipe to this system. If you live in a cold climate or where freezing is a problem be sure to drill a very small weep hole far enough down that water will drain down and not freeze when you are not using it.