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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.
Plasma: cell free blood + small amount of anti coag. Serum: cell free blood w/o fibrinogen. Plasma is prepared by centrifuge w/ anticoag added. Serum is just straight centrifuge so fibrinogen is busy making a clot and is removed from the solution of serum. both are yellow due to billirubin content.