A small amount of water from the exhaust would be normal. Depending on how quick you traveled back on the single engine you may not need to worry too much about it. I would have thought if there was a problem with the speed a lot more water would have come from the exhaust as it would have been full. But, if you really want to be sure, remove the plugs from the motor and turn it over to see if any water comes out of the plug ports. If nothing comes out, then you are all good. If water comes out you really need to get started on removing the oil and cleaning the water out before any significant damage is caused.