In a day, many health experts suggest that you drink about 3.7 liters of water or 125 fluid /ounces if you are a man, and if you are a woman, you would need to drink 91 fluid ounces. Now, converting the amount into standard bottle size, i.e. 500 ml, you get around 7.3, about 7.4 bottles. You must drink up to 5.3 to 5.4 bottles of water if you are a female.