That kind of depends on how much each water bottle holds.
If you carry your water in a 2-quart jug, then one jug can hold the entire 64 ounces.
If you do a lot of air-travel and need to carry...
Unfortunately, there is no standard size glass.
A shot glass can be one ounce, a large mug can be 16 ounces, and there are all sorts of other sizes.
This question cannot be answered unless you tell...
An ounce is a unit of mass. A fluid ounce is a unit of capacity. Without some unit of density to compare, it is not possible to convert between the two.