Water is fine, electronics are pretty waterproof.
water & power = dangerous situation as you can short out little components.
DO NOT TRY TO POWER IT ON UNTIL YOU ARE SURE IT IS DRY AND CLEAN.
take a piece of paper and trace out the layout of where you are going to work. Push the screws into the paper to keep them organized, this lets you put the right screw back in the right spot. They use different lengths in laptops and it can get bad if you overtighten a screw and snap a board.
Camera phones are your friend, snap lots of pics, you never know when you might need them.
If the machine got wet, put it in a large bag with rice, the rice will pull the moisture out the machine. DO NOT POWER ON until you are SURE it is dry.
Was this clean water? If there was any soda, coffee or other juice, the sugars will be a problem and it will need to be cleaned and rinsed before reassembly.
Youtube for a video on your model, there are many tear down guides, get a spunger (plastic knife for popping plastic tabs).
PM me with any questions, I do this day in day out.