i had this awhile back and knocked it out in about a week without antibiotics by drinking large amounts of juices, water, cranberry juice, lemon water, citric acid type fruit, etc. drinking all day. pissed it out basically.
i was in the usa where juices are much cheaper though and i was in a hot climate where it was easy to drink liquids.
the frequent urination went away so that's how i knew i got rid of it and it was not getting worse.
i also drank these "live probiotic" drinks that get pro bacteria in there to eat bad bacteria, which i could "feel working". would likely be expensive to buy in thailand so don't know if it's worth it here.
my only symptom was frequent urination. uti was noticed by lab tests during a routine physical.