RE: hole/depression on property, how do I make it a water hole?
It will depend where the hole is in the landscape. If it's at the top of a hill or knob, don't waste the effort trying to make a pond out of it. If it is in a swale or in an area that a fair amount of surface water can be diverted to, it might be worth a try. Lining it with a foot or two of clay or3" of bentinite under a foot of clay would be effective. Lay the clay in 6" lifts and run over the damp clay lining with heavy machinery and you'll get very good sealing. You still need a consistant source of water, be it surface runoff or groundwater.