Hi. Actually you have to see a doctor for a bladder infection for a urine test and antibiotics. Do not treat the infection on your own by just drinking water. You may feel better after a while but the bacteria may still be active and cause another bout of infection in the future. If the infection is not treated properly, it can spread to the kidneys.
If you have a bladder infection frequently, you will need to see a specialist. We need to make sure you have no underlying causes of the frequent infection such as stones.