I dropped my phone in water at school about an hour ago. The phone is working, turning on and off, but the touch screen is...

Same problem! I dropped my phone in water at school about an hour ago. The phone is working, turning on and off, but the touch screen is not. I tried holding the home button and off button for 20 seconds. The phone restarted but the screen still doesn’t work. I still have about 6 hours left of school, and I’m afraid that if I wait that long my phone will be beyond repair. Any tips what I can do at school before it’s too late? PLEASE HELP!