I have no insight into how much it would cost to drill and setup a well. It depends on how deep they would need to drill, how much GPM you need to have, and if your county even allows new wells to be drilled, etc. You're going to have to run your well water through a treatment system anyway, so if you have nearby pond, I'd research pulling your water out of it instead. Collecting rainwater in a cistern may be something to research as well. No matter what you do, you'll want to put thorough research in before starting.