Clean water is precious. Not every place has enough of it. If we waste water, one day there may not be enough for everyone. So we must use water carefully and never waste it.
Turn off the tap while brushing your teeth. Take a short shower instead of a long bath. Fix dripping taps. Use a glass of water to rinse, not a running tap. Water plants in the morning or evening so the sun does not dry the water. Use the water from washing vegetables to water plants. Report leaks to a grown-up.
Example: Mali used to leave the tap running while brushing. Now she fills a cup, turns off the tap, and uses only that cup. She saves many litres every day!