Probably the best way to save money is not to buy plastic bags to put your groceries in them. People should just buy one bag, which are available in most supermarkets, that are reusable. That way we save money and also the environment. Also, while brushing your teeth or doing the dishes , you should not let the water just run, use as much as you need. The best way to do that is to fill you sink with water, wash your dishes in that same water and then later rinse it in fresh water. It saves more that it might seem. When you leave the room, turn the lights off and when you are not at the computer just turn it off.