It does the same job as your old toilet, but with much less water. If you can't replace your toilet, install a water-saving device to reduce the amount of water used with each flush. These are available at most hardware stores. Install a low-flow showerhead. Keep a jug of drinking water in the fridge instead of running the tap until the water gets cold.
Taller grass shades new growth, grows slower and needs less water.
Water lawns and gardens before 11 a.m. or after 5 p.m. to reduce evaporation loss. Be careful to water only the lawn or garden, not the street or sidewalk. Water lawns and gardens once a week. They only need 2.5 centimetres of water a week, including rainfall. Collect rainwater to water plants.