Looking about DESIGN, I think that the requirements are:
Sustainable, net zero, affordability, high performance, I guess resisting natural disasters is also important; especially in areas with wild fire and tornados hazards. No mold, no termites.
I am working on the design of a single family dwelling using my Concrete Rib Construction Method, with an added feature of saving water. It is a concrete tank as the source to service the bath and kitchen fixtures by connecting straight to the tank, reducing the cost of plumbing. The tank is filled with rain water collected by the roof and sending the volume of water in excess to the tank capacity to a cistern in the side yard, covered with a concrete slab to be pumped to the tank. If the rain is not enough for the demand of the house functions, the local public utility will serve as backup.
I hope it works to keep the water use only for the people in the house.
I am posting this idea to appeal to the fellow architects to help me with the right solution, and work as a team to fight against the drought. I would welcome suggestions on how to incorporate the idea to existing dwellings.