Next time, take shower with tub stopped. Then compare water level. A large amount of water can be saved. Don't Waste Cold Water Stopper tub before turning on water. Initial cold water can be warmed by adding hot water later.
Small kids can go in together.
A medium amount of water can be saved. Wash Efficiently Use load selector for large or small loads if there is one. Otherwise, wash only full loads. Use cold water. You won't save water, but you will save energy and money.