My IPhone 4S won't turn off? - 1

Okay… So a few days ago I was eating cereal and perusing my phone leisurely when HOLYFREAKINGSHIT I just go and DROP the damn thing right in the milk! Ploop! Anyway, now the speakers don't work and I can't turn the thing off. In a few hours I'm boarding a plane and I've got to take my phone with me.So, help please!

Press the off button and home at the same time for a long period of time until the screen shuts off