When you wash your hands, reduce the water flow… Start by opening the cold water. Then, when you will rinse your hands, open the hot water.
When you take your shower, stop the water with a switch while you soap your hair and body…
Now, most of the washing liquids are effective with cold water. So wash your clothes with cold water !
Furthermore, if you are the type of person that rinses your glass and plates before to put them in the dishwasher, do it with cold water.
The water heating is one of the biggest wastes of energy in a house. All needs are good to try and diminish our consummation and save money, but also in order to save energy for our lovely planet.