What should we put in our storm celler?

Here in Oklahoma it seems storm season is starting early, luckily we dont live in the areas that were hit today, But it's served to remind us that tornados can come anytime of the year. We have a storm celler in our back yard, which we havent actually needed yet. but we need to put some things down there to be prepared for the coming storm season. i was thinking we might put our old kitchen table down there, and then put some rubber maid bin down there with some stuff to do, and a first aid kit. It stays pretty dry down there, we got alot of rain last summer and it didnt flood at all. But im not sure how hot/cold it gets down there. so would can food be ok down there? in the hot/cold? what all should go in the first aid kit? anything else you can think of putting down there? we have emergency flashlights here in the house, but we going to get some kind of battery lantern or something for down there too. Anything else you can think of?