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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
Caffeine-free fluids allow more water to stay in your body. This allows the colon to absorb the fluid, making your bowel movements soft. For every 1 cup of caffeinated fluids, the MBCP recommends that you drink 2 glasses of decaffeinated fluids.