This sounds like water in the shifter module, which is a frequent cause of problems on the W210. Many people have spilled drinks form the strategically located drink holder into the shifter rgions and end up with problems. Since you just have water, it's possible that it could be OK once that is fully dried, but it may also be toast. Search the threads on the W210 forum to see what others had to do.
Is the display back?

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