11. Cranberries Cranberries prevent bacteria from forming in the bladder, prostate and kidneys. It also deodorizes urine. They contain mannose, which is what helps to keep the entire urinary track from getting and infection. They also can help prevent kidney stones. They are antiviral and antibiotic. Because they are so sour, they need to be combined with either water, or another fruit to be palatable. I like to add apple or grape juices to the mix.