Fluid intake is the addition of water to the body. It is divided into two categories: (1) Water absorbed from into the gastrointestinal tract is water. On average, this is approximately milliliters of fluid intake per day.
(2) The water produced daily from and dehydration reactions is water. It is approximately mL of fluid per day. The sum of the average of both of these categories is mL. Given these average amounts the fluid absorbed from the digestive tract accounts for about % of daily fluid intake.