I have a granite rock (foot and a half thick....roughly 3 feet around) that my customer wants drilled and then put a hose in and up the hill to a mountain stream and gravity feed a bubble fountain or higher. 1) How big of a hole should I drill? 3/4 inch, 2 inch..what kind of drill (rent a hammer drill) 2) What kind of pipe should I use? garden hose, pvc, pex 3) What kind of elevation drop do I need to get a good bubble or fountain? I've drilled through concrete before with hammer drills....I assume I should have a water hose going on the rock when I drill it.