See your doctor. A UTI is caused by bacteria and your physician will likely prescribe antibiotics. It's important to drink lots of water during and after treatment because each time you urinate, the bladder cleanses itself a little bit more. Cranberry juice also has been shown to have positive effects on UTIs. Make sure the cranberry juice is 100% juice. Quality cranberry juice produces hippuric acid in the urine which acidifies the urine and prevents bacteria from sticking to the walls of the bladder. If pure cranberry juice is not available, cranberry capsules can be substituted. They can be found in most health food stores. Always take these with a large glass of water. Vitamin C may also be recommended.