Put a stopper in the sink and fill the sink with clean water. Keep a bottle of drinking water in the refrigerator. This ends the wasteful practice of running tap water to cool it off for drinking. Use your automatic washing machine for full loads only. Your automatic washer uses 30 to 35 gallons of water in a cycle.
Most automatic washers have a water level regulator.
To save water, use the appropriate setting. Plant drought-resistant trees and plants. There are many beautiful trees and plants that thrive with far less watering than other species. Check your local nursery. Put a layer of mulch around trees and plants .