Small lawns are best watered using a hosepipe with an adjustable spray nozzle, whilst a sprinkler system is ideal for a larger area.
Don't over water landscaping - Adjust the timing and operating days of the sprinkler system to only water the minimum amount of water needed.
You can build them yourself or buy kits to create a pyramid bed, complete with netting to keep birds away and a sprinkler system for the top.
You may need to invest in a long hose or a simple sprinkler system for water.
While you can't do anything about natural rainfall, you can control how much you provide through the sprinkler system or hose.