Avoid watering the lawn every single day. This is really wasteful considering that weekly watering is enough for the lawn even during summer months. You should actually avoid watering the lawn for some time when there has been a heavy downpour.
Plant your plants in such a way that they can make use of your roof runoff when it rains. Landscaping should actually be done smartly in that you can have water thirsty plants around areas where water collects and takes time to drain away.
If you must water your plans and the lawn, then make sure that you do this during early mornings before the temperatures rise and wind speed increases. When you time your watering schedules you will be able to minimize evaporation that can be wasteful. Consider the weather conditions before watering.
Use a broom to sweep clean your sidewalk or driveway instead of using a hose that uses gallons of water to clean off the debris and leaves from these areas. Alternatively, you can use an energy efficient blower for the same task.
Position your sprinklers so that your water does not get wasted on paved areas and instead lands where it is really needed. You should also consider irrigation devices that are water efficient such as drip irrigation and soaker hoses which go a long way in saving water.
Consider a higher cut for your lawn so as to promote deeper grass root growth, hold soil moisture and to offer shade for the root system so moisture is not lost faster. It is also very important that you avoid using fertilizer for your lawn because it increases the water need by the grass. If you must, then choose fertilizers that have nitrogen that is water soluble.
Consider a shut-off nozzle for your hoses so you are able to adjust the spray as needed for different areas. Once finished, you should remember to turn off your faucet instead of the nozzle because it can leak even when shut. It also helps to ensure that your sprinklers and hoses remain attended because you end up wasting too much water when you forget to turn them off. Make use of a timer to make sure you give only the intended amount of water to your garden.