Drain the trans and fill with some 10 wt. oil and marval mistery oil about 1/2 and 1/2 run the engine and leave the trans in neut. for maybe 30 min. than drain that should mix with the water and help carry the water out when You drain it right after You shut down the engine.Also You're going to have to open the ball joint that goes to the tube like Tim said to get the water out of there.Than refill with some gear lube .
Pete