BASIC CONSERVATION:

but if your water comes out of the faucet in one solid stream then you could acquire one of these to reduce your water usage.
2. Low- flush toilets: Look like any other toilet so I'll spare you the picture, but they use 1.6 gallons instead of the 3.5 gallons used since the 1980's.
3. Sonar - leak detection units: water gurgles, hisses,or thumps as it leaks and these instruments can pick up the vibration. 

ADVANCED CONSERVATION
A. USING NATURE'S BOUNTY4. RAIN BARRELS- a simple method for getting the gardens watered between summer storms. Could be used for many purposes in a pinch.
5. Swales vs. Culverts: gently sloping depressions that permit water to absorb into the soil instead of overflowing into streets or rushing it out to the local gully/river.
B. RECYCLE and REUSE
6. GREYWATER RECYCLING: Water from sinks, showers, and laundry can be reused (with minimal attention paid to detergents and soaps entering the soil) to water gardens and trees.