Water conservation is a commendable goal. In the current condition of our world it is important for all of us to assess and possibly modify wasteful behavior. Personal restraint and sacrifice is often appropriate for the greater good of society, and the planet on which we live.
A catchy name for your project will encourage strong formation of a group identity, and foster a positive perception by those who will be judging you.
I offer two names, either of which will do the job.
“AquaForce” (my favorite) and…
The reference provides a starting point by listing 10 ways to conserve water.