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Rainwater harvesting
Closing the tap when not in use
Not wasting water mindlessly 
are the most simple method to conserve water
some more points
try to prevent the water that is going down to drains ... hat can be used again
verify that there is no leakage in the taps and the pipes
avoid flushing toilets unnecessarily.
installing sprinklers in school gardens

This was shown in art attack:

Take a paper and draw water falling from the tap. Hang it to the door opener. Whenever you will see it, you will remember to save water