Samantha Lee/Business Insider
Feeling a cold coming on? Try gargling with plain water. A study of close to 400 healthy volunteers found that those who gargled with plain water were significantly less likely to come down with upper-respiratory-tract infections (URTIs) — a type of infection often linked with colds and the flu — during the study period than those who didn’t gargle. The researchers concluded that, "Simple water gargling was effective to prevent URTIs among healthy people."