I think that’s a question for google… I am not a mathematician.
Also it’s not up to, it’s at least 8 cups (64 ounces). I have to drink 10-12 a day.
I’d try to just drink it plain, or make some tea with stevia or something. I can’t remember what all is in Crystal Light, but I know it’s a lot of artificial stuff. If you ever aren’t sure about something, a good tool I like to use is fooducate.com :)