Many doctors recommend that you empty every three to four hours when awake to make surr that the bladder doesn't fill with more than about 16 ounces. That usually means you shouldn't drink more than around 4 ounces per hour. If you exceed the 16-ounce capacity limit of your bladder, you can stretch the muscles and run the risk of infection or urine backup. Besides regular emptying, you should try to keep pressures low in the bladder. Probably the best way to do this is to keep volumes low, which means limit the amount of urine buildup in the bladder between voidings.
High pressure can cause reflux and kidney damage.
The doctor very likely will tell you to drink more fluids to flush out the bacteria. Doing so will limit the growth of bacteria and formation of stones in the kidneys, uterus or bladder. Some doctors recommend drinking at least 10 glasses a day of water, Kool-Aid, juices, or decaffeinated tea. Increase your fluid intake if signs of infection occur. Keep your catheter or legbag clean by washing or sterilizing regularly.