See how light a spray you can wash with. It is not necessary to shower longer than five minutes. Remodel with low consumption shower heads. Don't fill up higher water splashes easily. Recycle wading water for plants, shrubs, lawns.
Scrape dishes off.
Soak pots and pans overnight if necessary. Wash only full loads. Experiment to discover least possible detergent necessary to cut down on suds residue. Make only the amount of coffee or tea you are going to drink. Use ice cubes to cool water.