2007 Honda Fit water tapping noise from under the hood

I just bought this 2007 Honda Fit sports manual transmission. the next day I ran into a puddle of water due to heavy rain. since then, as I turn on the engine or when I slow down to stop the car, it makes water going up and down, side to side just like a water going through narrow passage. I can't see any visible water under the hood, or inside the car. Where does this noise come from? The car runs fine with no problem with any electric function.