Cranberry juice, the highest concentration you can get. Actually there's an anti-spasmodic for the bladder which turns the urine bright orange which will give pain relief but not cure the infection. It's over-the-counter. Pyridium, Azo-Standard, Uromide are trade names. The chemical short name is phenazopyridine hydrochloride. Not advising or prescribing for you, just saying it exists OTC.