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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.
Introduction The great majority of most common fluids (liquids and gases) such as water, organic solvents, oils, air, steam, nitrogen or rare gases are Newtonian in wide temperature and pressure ranges. This fact justifies that classical textbooks on Fluid Mechanics are devoted to the study of Newtonian fluid dynamics.