I worked in the more or less ...

I worked in the more or less similar case but the number was a bit less ( around 450 people), here is what I did:

1) Divided into 10 groups depending on their location within the village, each group elected its leader

2) the ten leaders gathered and elected the overall leader with a committee of 4

3) All communication passed through the leaders and reached all individuals in the village and vice-versa.

4) During each phase of project the manpower used to come from the village and selected with help of the leaders

5) As the beneficiaries would own and manage the system after it has completed, the leader of each group provided 2 active people ( in total 20) whom we trained and worked with them throughout the lifetime of that project, later those trained local citizens became technicians and are helping the village in sustaining the infrastructure in place.

As you mentioned, you need to acquaint the village with sufficient water all year round, do u have an alternative source of water which will supplement the existing one so that you designs are going to base on that?  ( in my case we considered also a decentralized rainwater harvesting) you need also to work on the behaviour change on how the demand can be reduced through the proper usage of the available resource.

All the best.