Hello Amandeep,
You are in hurry!!!!
You DON'T have tu use your phone after water damage.
If is possible:
REMOVE IMMEDIATELY THE BATTERY AND DON'T TRY TO TURN IT ON
in any case put the phone in a fridge plastic bag with a lot of rice.
The amount of rice depends by how is big your phone.
Leave it in the bag with the rice at least for 2 days!
Unfortunately a lot of hour are gone from your message, the more you have try tu use the phone, the more you have damaged it!
Try at first with the rice then if you have a LOT of LUCK your phone will be alive otherwise you will have to give the phone to a technician lab where the phone will be disassembled and the washed with a solution like isopropilic alcohol and ultrasound.
I cross my finger for you..