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Self-cleaning water bottles use UV-C light to kill bacteria, viruses, protozoa and other micro-organisms by destroying their DNA. The UV light sterilizes both the water in the bottle and the interior surface of the bottle.
UV-C light serves as a convenient, mostly hands-off way to keep reusable water bottles clean without the need for chemicals or soap. Most self-cleaning water bottles, including the three covered in this article, also have all the features you'd look for in a normal reusable water bottle: They keep steaming hot water hot and cold water cold (or room temperature water at room temperature), and they're durable.