Rainwater harvesting is a great way to reduce water usage for a home. There are a variety of options for both the capture and storage of rainwater.

There are numerous options for high efficiency dishwashers and clothes washers, indicated by the government's Energy Star label. These appliances significantly reduce both energy and water usage.

Utilization of low flow plumbing fixtures can save 40-50% of water utilization.

One of the easiest ways to save water is to install toilets that utilize grey water from bathroom sinks and/or showers for flushing, thus saving up to 40% of water usage.

When combined with a rainwater harvesting for irrigation, grey water systems can dramatically reduce the amount of water utilized by the home.

Tankless water heaters have come down in price over the past few years. They reduce water usage, and electric tankless water heaters can be run from solar power.

Solar pool covers and heaters provide the power for pools and help reduce water lost to evaporation.

There are a huge number of options for coordination of home components, with Amazon and Google leading the pack.