Installing efficient taps and aerators will control the amount of water you use.
Aerators are inexpensive, easy to install and can reduce water flow by 50 per cent.
Hate wasting cold water while you wait for the hot water? A water diverter can be installed so cold water diverts to your water tank while you wait for the hot water to arrive.
Install a water diverter to avoid wasting cold water before it warms up.
Talk to your builder about water recapture options such as diverters to a rain water tank.