8 Glasses a Day - OK, but what's the Challenge?

Let's see, I joined the Delicious Change group, some free Crystal Light would be nice to have, but I don't understand what the challenge is all about. Here is the blurb from gather:

Are focused on keeping yourself hydrated and getting the recommended eight glasses of water each day? Join us in the Eight Glasses a Day Challenge. We want you to drink eight glasses of water a day for eight days straight. We hope from it you will develop a healthy habit to keep yourself hydrated!

Beyond the odd Gather grammar I just don't get where the challenge is in all of this.
Do I have to "add" another 8 glasses of water per day to my regular routine?

I currently drink 2 to 3 liters of water, some days more, depending on what I am doing on any given day. The greater my activity, the more water I have to drink. A day spent mostly at my desk will be closer to just 2 liters of agua, but if I go for a run, bike ride, hike, snow-shoe or need to chop wood, fix fence, or any of a myriad of other chores around the ol' homestead, I will drink much more to replace all the sweat.

When I think of drinking water, I think of crisp, cold, crystal clear Rocky Mountain spring water! No, not Coors beer, though I occasionally enjoy one of those on a hot afternoon or with a plate of enchiladas, which just happens to be brewed with the same type of water I prefer to drink. The "water" I drink is just that - water! Nothing but real and fresh water in my glass or my CamelBack. I try to avoid pre-bottled water if I can, but if I am on the go I may buy a bottle of water every once in a while.

I also drink some flavored water during the day, but I do not count that in my 2+ liters per day of water. Most mornings start with coffee, sometimes tea, but only after my first of the day glass of water and vitamins. During the day there might be some iced-tea or even some drinks made with Crystal Light, I especially like their lemon-aide, or one of Coors' servings of Rocky Mountain spring water, but none of these count in my daily ration of water.

So, to this liquid challenge, unless I am going to get catherized or spend the entire day sitting on the toilet, I just do not know of a way to add 8 more glasses of water, flavored or original, to my already very fluid daily routine!