If im to drink 64 oz of water how many 12 glasses do i drink?

To determine how many 12 oz glasses you can fill from 64 oz of water, you need to divide the total volume of water by the volume of each glass. Here's the calculation:

64 oz (total water) / 12 oz (per glass) = 5.33 glasses

Since you can't partially fill a glass, you can fill 5 full glasses of 12 oz each.