Great! My life is not nearly as complicated as it outta be. :-)
Okay, I will. :-) I have yet to look at the on-demand propane water heater's specifications for water pressure to see what its tolerances are, but at the moment I am considering locating the water source 120 feet above the outlet.
We will probably create our own flat area on the hill to bury the water collection box (55 gallon drum), so the hill will not force us to pick a site we don't want--- unless we hit a boulder. But then we also got some dynamite.
Current water lines on the ranch are 1.5 diameter. I suppose the owners of the ranch will want to keep the same diameter, since there are already tools and spare parts for that size.
I have been force to drink such water when I hiked across the Mojave Desert and then up the length of Death Valley (for fun; no, really). Fortunately the water here is extremely clean: it comes out of rocks and flows into a concrete tank at the spring; the spring and tank are covered with plastic sheeting, plywood, and rocks. Two of the three humans who live here have been drinking it for 11 years.
For 40 years that water used to be transported down to the ranch via cedar logs that had been carved into troughs like a flue; 30 years ago that flue was replaced with hose.
There is another good spring down the canyon a mile that was once flued down to the canyon floor (well, a bench 30 feet above the canyon floor) around 70 years ago. It is located at the base of a cliff wall that rises 1,700 feet. I climb up there now and then to get a drink. :-)