my tab touched water and went off i have dried it and i charged it and it didnt come on

It can take days for a device to dry and usually it needs to be opened up, any SD or SIM cards removed and the battery removed to avoid as much damage as possible. Plus it can take days if not a week or more to totally dry out (and that is with it open). To charge it or try and use it when it could still have liquid in it (even just a little) risks completely frying the device.
 


 


It is up to a month now .and i have tried all drying techniques.i think the fault is when i was trying to open the tab i might have put the object in the charging piont and it might have affected something.