Take shorter showers. Don't run the water while brushing your teeth or shaving.
Wash only full loads in the washing machine or dishwasher. Avoid pre-rinsing dishes, which is not needed for many modern dishwashers.
Take your car to a car wash facility that uses recycled water. When waiting for the water to heat up, catch the cold water in a bucket and re-use it.
Don’t use your toilet as a trash can – throw trash in the trash can.
There are many websites that offer indoor water saving tips – here is just one: http://www.home-water-works.org/indoor-use