Chances are if you are asking the question then you are. Don't worry. You aren't alone. According to latest study on adult dehydration, 75% of Americans are dehydrated. Most only drink 2.5 cups of water daily. This is because most people don't like the taste of plain water. Water tastes differently depending on where you are in the country. Near the coastline, water can be more sulfuric versus in middle America.