Random tip for those who haven’t bought cranberry pills before… When I first shopped for them, I was surprised that one of the pill varieties at GNC had way more cranberry for a much lower price than one of the others. Turns out that they were different substances, so the numbers weren’t directly comparable (i.e. one was “cranberry juice extract” and the other was “cranberry extract” or something like that). I didn’t realize that until I was home with the cheaper, juice-based ones.
As Kiminy just mentioned though, cranberry products don’t seem to help once you have a problem. I hear that they help if you take them continuously, even when you’re healthy, but I’m too lazy to do that, so I just rely on the handy water flush method I described above. 