How Much Water Should You Be Drinking

I've always wondered how much water should I actually be drinking daily and came across this chart when doing some research on it. It says to drink 1 glass for every 20 lbs of your body mass daily.  Makes sense since our bodies are made up of approx. 80% water and needs this water to function optimally.  It might seem like a lot to some but when you carry around a water bottle with you it's pretty easy. I used to think the same thing until I put at water bottle at my desk. Sometimes people don't realize that your dizzy spells or headaches are caused by dehydration. Drink up people! :)