That's 105 gallons a week or 5,460 wasted gallons of water a year. Don't let the faucet run when you scrub vegetables or prepare other foods. Put a stopper in the sink instead. Do not use running water to thaw meat or other frozen foods. Defrost food overnight in the refrigerator or by using the defrost setting on your microwave.
Garbage disposals require lots of water to operate properly.
Composting scraps will also reduce demand on our landfills and wastewater reclamation facilities. Automatic dishwashers claim the most water in kitchens, about 14 gallons per load. Fill your dishwasher full because it will use the same amount of water for a normal cycle, whether it contains a full load of dishes or just a few items. Also, there's really no need to fully wash dishes before loading in the dishwasher. Just scrape the food off and let the dishwasher do the rest of the work.