take a shorter shower than you are used to when brushing your teeth turn the sink off.
When you buy vegetable and fruit remember to wash them in a basin and use a vegetable brush to remove the dirt. when using a dishwasher let it run for a few minutes and use washing machine only when full.
Drinking sink water is more healthy than drinkng for bottles of water. So instead of buying pack of water bottle grab a bottle and full it up with so sink water and see how much money, water you are saving