Liquids that you drink turned into the urine, which flushes harmful bacteria out of your urinary tract. Water is the best fluid to drink for healthy urination. If you can’t drink 6 to 8-ounce glasses of water each day because of a health condition, like bladder control problems, kidney disease or heart disease, talk to your doctor and make sure you stay hydrated and are urinating enough to keep your urinary tract healthy.