Abstract: A water sanitization cap for covering a bottle is provided. The cap may screw-fit on a conventional water bottle. The conventional water bottle may store drinking water. The cap may include a UV-C module. When activated, the UV-C module may destroy bacteria and/or viruses within the water. The cap may also include a cartridge. The cartridge may be a filter cartridge, pH modifying cartridge and/or a flavor-enhancing cartridge. The cartridge may filter out particulate matter, modify the pH and/or enhance the flavor of the water when water is being suctioned out of the bottle. The water may be suctioned out of the bottle using a foldaway straw included in the cap.