For drilling in hard rock to access groundwater, the company should use a percussive drill, specifically a rotary percussion drill or dth (down-the-hole) hammer drill. These drills are designed to pound the rock and break it apart effectively.
For bringing the water to the surface, they should use a submersible pump. Submersible pumps are designed to operate underwater and can efficiently lift water from the well to the surface.
In summary, the company should use a rotary percussion drill along with a submersible pump for this project.