As for this question, an eletrical plug fell into water, the way we see, which actually depends on the following two different situations.
1)For a single plug, you just need to dry it out with a dry tower immediately;
2)For the whole charger, you should not only dry out the charger, but also test the output voltage of the charger with a multimeter. That’s to say, after confirming the value of charger is normal you are able to use it.