When you take a bath, only partially fill the tub. A good rule is five inches. As you wait for shower water to heat up, collect the cold water in a bucket for watering plants. Reduce the amount of water the toilet uses to filling a one-gallon plastic container with water and putting it in the tank to displace one gallon of tank water. Laundry n Wash clothes when they are dirty, not just to remove wrinkles.
Hand wash several items at the same time.
Use the final rinse water from one group of items as the wash water for the next group. Launder only full loads. If the washing machine has a water-level control, adjust it to the laundry load size. Use good laundering techniques. Sort clothes and follow the detergent recommendations carefully.