The basic question below is ...

The basic question below is very important: irrigation or domestic consumption. I'll assume it's for consumption. Our company is in Colorado and there could be a very good market for such a system in places where well yield is low or groundwater is too highly contaminated (usually in the mountains). 

You have to know how much water your are trying to supply. That water has to be stored, and it must be protected in that storage from bacteria development. I would use ozone.

Next, you have to get the water out of storage and too the clients. This will require some sort of pump. Pump size will be determined by how much water has to be delivered to clients. 

At some point in this process, probably prior to storage, you need to filter the water. Some sort of high capacity, back-washing ultra-filtration membrane should work, and some pre-filtration to reduce backwash intervals. You'll also likely want some carbon filtration, probably on the outbound side, to ensure the water tastes good and has no strange odors.

Of course, all of this depends on the water quality going into the system and the number of locations you are trying to supply.  

Good luck!

Tom