Besides my D-Mannose, I buy organic unsweetened cranberry juice. It is SOUR. But I dilute it in the water bottles I drink throughout the day.
I’ve tried the unsweetened juice in water when I pregnant and was dead set against taking antibiotics and hadn’t discovered the pills yet. But other than that I just couldn’t keep choking it down, especially when the pills work just as well for me. I might try the juice again though since I’ve now discovered monk fruit sweetener. I suspect that plain cranberry juice has some other health benefits that would make it worth including.