I was going to say to mix the juice. You can buy cranberry mixed with apple juice (natural sweetner) and it's quite nice. Oceanspray makes quite a few sugar free mixes. You don't want the sugar when you have an infection.
Also drink tons and tons of clear fluids (water, herbal tea...) until your pee runs clear and the infection passes. Vitaminc C is also good. I've had a couple mild ones and managed to get them to clear up myself but you do not want them to get worse. I took advil too for the pain and because it's an anti-inflammatory.
I hope it clears up for you quickly!