cranberry juice

I have a friend who has been a heavy drinker and drug abuser for 20+ years. He has been off all drugs and alcohol excluding cigarettes and tobacco for seven weeks now. Tuesday night, he told us that he was hurting badly and when we looked into it, we are thinking that it is a kidney infection...

Does anyone know a natural remedy for a UTI due to Klebsiella Pneumoniae? (I have read that D-Mannose is only good for infections due to E. Coli...)