How much does it cost to get my iPod touch replaced?

Okay here's the story. I'm sure everyone knows that trick where if you drop Mentos in coke it explodes. Well, i was using my iPod touch to film my brother doing it, but it exploded quicker than we thought it would, and when it did I got coke all over my iPod. Now there is a white line going across the screen and the screen occasionally flickers and stays white so I have to lock it and continue from there. Inevitably, I need a new iPod. How much will it be to get a replacement iPod from Apple? I'm sure they'll charge me. And by the way, the water damage dot is still white.