wut is the very worst thing that could happen if water got through my air filter and how much would it cost to fix it. It's not like it was a continuous flow, but just drops here and there.

 

Check the oil and if it's milky then water got in the motor. Just change the oil and filter until the oil is clean and all the water is out of the motor. Also, you may want to drain the carburetor bowl to get any water out of the carb. I really wouldn't worry about it much. I have drowned out my Foreman many times and all I do is dry out the air filter and drain the carb and it fires right up. After I get home I'll change the oil a couple of times to get the water out of the motor. It still runs like a champ even though it's been drowned out a few times. It has even been floating upside down in a river after I hit a deep spot and doesn't smoke or anything.

 

it still fires up ok but runs a little rough. How many times did you have to change the oil?

 

Until all the water is out (until the oil isn't milky any more). As far as running rough, draining the carb. should fix that.