To encourage children to develop good sustainability habits sometimes they just need a visual reminder (this also can apply to adults)
We have in our collection some vinyl sticker to help out - Turn the lights off and Turn the tap off. www.pdfeducationsupplies.com.au.
Just by turning off the tap while you brush your teeth in the morning and before bedtime, you can save up to 30 litres of water! That adds up to more than 900 litres a month, enough to fill a huge fish tank that holds 6 small sharks!
The same is true when you wash dishes. Turn off the tap! Scrape your dirty dishes into the trash—then put them in the dishwasher.