how much water do you really drink?

I found a 74 oz water bottle at Big Lots. My goal is to drink that every day and then some if I can. Since I can't take it with me when I go to someone's desk to work on their computer, I generally drink as much as I can between calls for help.
I have also read about drinking half you weight in ounces. It seems reasonable since most of your body is made up of water.
I add either a green tea bag or some lemon juice to my water. There is diet cranberry juice produced by Ocean Spray. I have now started adding some diet cranberry juice to the water to give it some flavor and some vitamins.

I have a 24 oz. cup that I use for drinking water. By noon I've usually already drank 5-6 of those which is 15-18 cups of water. By the end of the day I've probably had about 21-24 cups of water and thats not including the 3 12 oz. cups of green tea that I'll drink a day. I just let the color of my urine tell me if I'm drinking to much,but I'm extremely anemic and have to take lots of iron and all the water keeps me from being terribly constipated( sorry if too much info).