You can prevent urinary tract infections by making sure you always empty your bladder completely when you go to the bathroom.  
Women, in particular,may benefit from the following:

Drink plenty of liquids, especially water. Cranberry juice may have infection-fighting properties.
Urinate frequently, and avoid retaining your urine for a long time after you feel the urge to void.
Wipe from front to back after a bowel movement to prevent bacteria in the anal region from spreading to the vagina and urethra.
Take showers rather than bubble baths.
Wash the skin around the vagina and anus daily.
Empty your bladder as soon as possible after intercourse, and drink a full glass of water to help flush bacteria.
Avoid using deodorant sprays or feminine products such as douches in the genital area that could irritate the urethra.
Wear cotton underwear
If you are sexually active, make sure you wash your genital area and urinate after intercourse. This will help to remove any bacteria that could 
travel up the urethra.

Men can prevent UTIs by wearing condoms during intercourse. If you are uncircumcised, make sure you wash carefully under your foreskin 
each time you bathe.

UTIs can be painful, but you can take steps to ease your discomfort until antibiotics clear the infection. Sometimes a heating pad placed over 
the abdomen can help minimize feelings of stomach pressure or pain. It's also a good idea to avoid coffee, alcohol, soft drinks with caffeine, 
citrus juices and spicy foods until you have finished a course of antibiotics. These items can irritate the bladder and aggravate the frequent or 
urgent need to urinate.

Click here