Hi,
Please confirm the make and model number of the tablet if it is not an Ematic EXP8?
''The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the tablet’s operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away''
''First ***do not try to charge or to turn on your tablet*** and then ***remove the battery as soon as possible*** from the tablet'' to minimize any further damage.
Then you need to dis-assemble the rest of the tablet and clean ''all the affected parts'' using ***Isopropyl Alcohol 99%+*** (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better
Here is a link that describes the process. [[Electronics Water Damage]]
As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well
Hopefully after you have done all this the tablet ''might'' possibly work correctly again.
Here is a link to the ifixit guide(s) for replacing the battery in an [[Topic:Ematic EXP8]] which will help you to open the tablet etc.
If this process seems too daunting, take your tablet to a reputable, professional phone 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''.