Many studies have found that drinking cranberry juice may help you avoid urinary tract infections. It appears that cranberry juice prevents infection-causing bacteria from bedding down in your bladder, and it also has a very mild antibiotic affect. Drinking as little as 4 ounces of cranberry juice a day can help keep your bladder infection-free. But if you tend to get UTIs or are dealing with one right now, try to drink at least 2 to 4 glasses of cranberry juice a day. If pure cranberry juice is just too bitter for your taste buds, you can substitute cranberry juice cocktail . It seems to have the same effect as the pure stuff. Take note: If you have a UTI, cranberry juice is not a replacement for doctor-prescribed antibiotics in treating your infection.