The disease that can be prevented by not sharing a water bottle is a Staph infection. This is because Staphylococcus aureus bacteria can spread from one person to another through shared personal items. Other options like athlete's foot, gum disease, and flu do not primarily spread through shared water bottles.
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Sharing a water bottle can lead to the spread of a Staph infection, making it essential to avoid sharing personal items to reduce health risks. Other diseases listed, such as athlete's foot and gum disease, are not transmitted this way. In summary, the most preventable illness through not sharing a water bottle is a Staph infection. ;