Been hearing a lot about drinking cranberry juice to prevent uti's...Is this true? I am very prone to them for an unknown reason...

Maybe. Studies are not consistent with some suggesting benefit and others finding no benefit. Theoretically, cranberry juice may work because it contains a substance that inhibits the ability of bacteria to attach to cells that line the urinary tract. There is no reason not to try it.
My pt's seem to. Believe it does.! fluid can't hurt!- if you get uti's frequently you should get urine culture ; sensitivity ; treatment.