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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.
However, it's not used for resuscitation because, as its glucose is metabolized, this fluid quickly becomes hypotonic. In fact, D5W is a good source of free water.1 As with other hypotonic fluids, such as 0.45% NS, the water quickly shifts out of the vascular bed and into the cells, by way of osmosis.