As you know water and electronics and electricity are not a good mix.
The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the laptop’s operating design and could damage the components.
The corrosion is ongoing until it is cleaned away
First do not turn on your laptop and then you need to disconnect the battery as soon as possible from the laptop systemboard to minimize any further damage.
Then you need to inspect the rest of the laptop and clean all the affected parts using Isopropyl Alcohol 99%+ (available from electronics parts stores) to remove all traces of corrosion and water. Do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain scents or other additives and is not as effective. If you do use it check the label to verify the amount of IPA. The higher the IPA percentage the better
Here is a link that describes the process.
Electronics Water Damage
As always with electronics, especially surface mounted PCBs be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board.
Hopefully after you have done all this the laptop might possibly work correctly again.
Here is a link to the hardware maintenance manual for the laptop which should be of some help in the dis-assembly process so that the laptop can be inspected and cleaned etc
If this process seems too daunting, contact a reputable, professional laptop repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.