You can lose up to 200 gallons of water a day from a leaking toilet. And a faucet can drip 604,800 drops while you are waiting. Taking a shortcut and using the hot water tap when cooking. That's taboo, and it can shortcut your health. Lead can dissolve into hot water from lead pipes and solder.
Cold water is better.
Heat it on the stove when cooking or making baby formula. Slipping used motor oil into a storm sewer or burying it in the trash. Hey slick, oil can leak into lakes, rivers, and wells. Just one pint can expand over an acre of water. Take your used oil to a recycling center.