Safe water supports drinking, food preparation and hygiene. Water contaminated by harmful microorganisms can transmit infections, including cholera and typhoid. Adequate water supply, sanitation and management of water sources help protect health. This article introduces water safety only. It does not specify household treatment quantities or determine whether a particular water source is safe. Use a clean, suitable water-storage container with a close-fitting lid; a tap or narrow opening helps avoid dipping hands or dirty cups into water. Keep serving utensils clean. Clear-looking water may still be contaminated. Ask a local health or water service about testing and suitable treatment when safety is uncertain. This guide cannot certify a well or calculate chlorine amounts.