how many oz in a cup of water?
Â· just now. 1  There are 8 ounces in 1 cup of water. 8 cups of water is equal to 64 ounces (8 x 8 = 64) Tom ã Â· 6 years ago. 2  This Site Might Help You. RE: 3  I keep a container in my refrigerator that hold 64 ounces of water. Of course first thing in the morning on Thursday so I drink some water. 4  8 ounces equals 1 cup. Really what you want to do is buy bottled water, typically it has 2 cups or 16 ounces. Drink it throughout the day. Supplement with vitamins and a healthy diet.