Take a guess. What percent of your body is water? Less than 50%? Less than 60%? Maybe 70%? The answer is your body is 65-70% water, but less so if you have more body fat. Water is therefore quite obviously SUPER IMPORTANT. The average adult eliminates about 2.5 liters of water per day. You will get some water replacement from your food intake but the rest needs to come from water - H20! Pure and simple and FREE. Stay away from sugar soda. Not even diet soda. No coffee, though this might be a little harder... Just stay away from sugar and fat loaded coffee. Water – that clear, earth given refreshment is the best of all.