High Quality Content by WIKIPEDIA articles! Reusing water bottles is the practice of refilling and reuse of plastic or glass water bottles designed for one use, with tap water for multiple uses. Reusing single-use bottles is a common domestic practice. Typically the bottle is washed out with warm soapy water after each use. Periodically a bleach solution may be employed to kill bacteria. Washing and re-using bottles cuts down on waste and landfill, and drinking tap water is much less resource-intensive than buying commercially bottled water.