What I would do is remove the spark plugs and crank it to free the water from the cylinders (if any). If you get water out, then immediately drain the oil. That will also remove the coolant from the crankcase. The coolant will eat at the bearings. If you remove it quickly enough, you will most likely avoid damage to the crank.
Then, it'* own to finding the cause of the failure. Most likely it was a combination of the upper intake manifold and lower intake gaskets failing. An excellent procedure that I used for changing my upper intake and lower gaskets can be found here:
And, of course, follow the procedure outlined in a Chiltons Manual for the proper torque specs, etc.
BTW, how many miles are on your car?