Hello and welcome to HCM.
Thank you for writing to us.
A UTI is an infection, and unless the infection-causing bacteria is dealt with and killed, it will return. Even incomplete or inadequate antibiotic therapy does not completely kill the bacteria, thus you will have to visit a doctor.
Both cranberry juice and plenty of water will only help reduce the symptoms. But, will not treat the cause. Thus, my advice would be to visit a doctor for antibiotic therapy (eg. ciprofloxacin
, etc.) depending on which antibiotic you are most sensitive to.
I hope this information helps. Do write back to me for any further information or clarifications.