drop of water on mousepad of macbook pro and now the mouse is being odd?
This sounds like you may have liquid damage to the system. If this is the case, the issues won't just go away. Water-based liquids are very corrosive to electronics and the damage cannot undo itself. However, you can certainly take it to the Genius Bar. However, I wouldn't mention the water droplets to them. If they can't visibly see the liquid damage and can confirm the issue (and provided you are under warranty), they may replace the trackpad piece free of charge.