If you think you got some water in the engine and it did not end in severe damage, count yourself lucky. The next step is to pull the spark plugs and crank the starter. This will shoot any water that got into the cylinders out safely. Once you have cycled the engine a few times, you can put the plugs back in. This is also a good time to check the fan and radiator to make sure they did not meet and hurt each other when you were playing scuba Jeeper.