Expanding water system in remote village of Haiti

Good morning:
I am a newbie to solar pumps and systems and could use some help with a task to expand a current water system to a site where a new education center is going to be built. The existing system source is a mountain spring which is piped directly about 5 miles to the town of Miragoane, Haiti on the north shore of the southwest peninsula of Haiti The town we are working in is Lebrun and there are some offshoot pipes to service various spots in the town, separate from the Miragoane feed. The Lebrun gravity system gets to within a 1/4 mile of our site and we will be tapping into a 1 1/4" PVC pipe that services a school. I don't have pressures at the tie-in point but maybe we can assume some minimal pressure of 10 psi or so. The destination is slightly higher than the source as best I can tell, so pump(s) will be needed.

So, in a nutshell:
Tie-in to 1 1/4" PVC with a Tee at elevation 1720 ft. +-.
Pressure roughly 10 psi at tie-in.
Output at Elevation 1840 ft. +-
Slope Distance: 1400 ft. +-
How much water is needed? I don't really know... but whatever is done will surely beat the current bucket and haul system! Maybe 4 or so 55 gallon containers and 2 or so GPM. Maybe tank-less if possible. Maybe solar pasteurizers?

What are the best options? Thanks so much to anyone who can help steer me in the right direction.
Chris