 [ Symptoms ] how much is 900 ml of water  trying to drink 8 glasses of water a day is hard when you work 9 hours a day is a 900ml bottle of water a good serving during work hours [ Disease ] there is 30 ml in each ounce an 8 oz glass has 240 ml a 900 ml bottle is just about a quart or almost four glasses so fill up twice drink it and you will be reaching your fluid intake goal see and we thought we would never use math