It depends on the bottle. The normal sized bottles have 16 ounces in them which is 2 cups. Some of the larger bottles will have 20 or 24 ources (2.5 or 3 cups). Every 8 ounces equals one cup. Now as far as needing 8 cups of water each day goes that is old information.
A gigabyte (GB) is a measure of computer data storage capacity that is roughly equivalent to 1 billion bytes. A gigabyte is two to the 30th power or 1,073,741,824 in decimal notation. The term is pronounced with two hard Gs. The prefix giga comes from a Greek word meaning giant.
An Exabyte is approximately 1,000 Petabytes. Another way to look at it is that an Exabyte is approximately one quintillion bytes or one billion Gigabytes. There is not much to compare an Exabyte to.