Glass = 8 oz; quart is 32 oz so that would be 4 glasses/cups of water.

As for the amount...I was also told that one should drink 1/2 body weight. I drink about 90 oz a day...sometimes more, sometimes less but I always make sure I get at least 64 oz. I find that when I skimp on water consumption, my losses slow down..or even stop (if the water consumption is low for a few days).