I don't think your little water caused a problem. The sqeeling was probably a slipping belt. Change it and make sure it's got the right tension...and not too much.
It almost sounds like it's not firing on all 4. Check all the plugs to make sure they are all tight...at the same time you might want to change them. Remeber to tighten them....but again not too tight.
If this doesn't cure it then look at the plug wires. If you can get the motor to idle or even get someone to sit in the vehicle while it runs at a fairly low rpm. If you can get a constant rpm then you pull ONE plug wire at a time and then listen to the motor. If the sound doens't change then that cylinder is not firing. If it dies or sputters more then that one is ok.
While you are working on it you should do the air filter, PCV valve, change oil and filter, rotor cap and wires, fuel filter. Adjust valves and check timing. It all cost money but in the end you'll save fuel money and it will run better. You can even run a unjector cleaner in the tank and run a few tanks of high test.
My best guess is not running on 4 cylinders.