Take shorter showers. Use less water for bathing. Fix your showerhead leaks immediately. Scrape, don't rinse your dishes before loading. Check each model's water requirements when shopping for a new dishwasher.
SINK Install a low-flow faucet aerator.
Install an aerator with a shutoff valve. Fix your faucet leaks immediately. While doing dishes, washing vegetables, etc. turn off the water. Keep a container of cold water in the refrigerator. Thaw frozen food in the refrigerator or micro- wave, not under running water.