I can see that as one gets dehydrated that their mood goes down too. Many people I believe that have a bad mood may also be dehydrated. I would hope that people start learning that proper hydration can cure a lot of things. Having your body wash itself out with clean water can help get rid of bad stuff withing your body. I know I drink a lot of water daily. Usually between 160-200 ounces a day.I believe that factors into 4-5 liters a day.