White smoke and dead battery

Hi all im realy hoping someone can help. I was driving from town then all of a sudden loads of white smoke like fog came out the back followed by what sounded like a faint pop. then 2 second later loss of power. So I pulled over and tried to start nothing no lights or anything. Battery completely dead. It has been raining around here badly and I drove through a large puddle last night and I know the renault megane 1.9 dci ii don't like water. So if anyone can help I'd be great full.