Actually, it's the same water. The water from you faucet could contain molecules that dinosaurs drank. Perhaps Columbus sailed across it. Every glass of water brought to your table in a restaurant requires another two glasses of water to wash and rinse the glass. Since nearly 70 million meals are served each day in US restaurants, we'd save more than 26 million gallons of water if only one person in four declined the complimentary glassful.
Some people thoughtlessly flush away tissues and other bits of trash in the toilet.
Using a wastebasket, instead, will save all those gallons of water that otherwise go wastefully down the drain. Don't let the water run when you brush your teeth or when washing your face. Most of it will be wasted. Just take what you need and save the rest. When you clean the tank, use the dirty water on your house plants.