The DIY technique involves water pumped down the center of a PVC schedule 40 pipe used as both a drill stem and a drill bit. At the bottom end of the PVC pipe a “drill bit” is fashioned by cutting teeth into the end of the PVC pipe. The pipe is rotated back and forth as the PVC pipe is slowly worked into the ground while the cuttings are brought to the surface by the upward flow of water in the annular space around the pipe. If you want to dig your own well, try this technique.
Source: drillyourownwell.com