I know this is somewhere else but I'm just posting it here to jog the memory of early starters. Since I was just thinking about this.
The Town of Fontana does not have a ATM, nor does it have acceptable re-supplies till around the third week of March when the General Store opens. The gas station didn't even have Snickers Bars and only had 2 or 3 brands of cigarettes all which were brands i've never seen anyone smoke. Salem & Merit come to mind.
If your arriving before then you will want a maildrop here and to have cash in your pocket if you don't carry credit cards and are planning on staying at the Fontana Inn or their Bunk House. I got screwed here in 2002 because of these reasons. I ended up having to take a $40 shuttle into another town to get cash to stay at the Fontana Inn and get food supplies.
If you are staying at the Hike Inn you have nothing to worry about since they shuttle all their guests into another town to shop. And if your staying at the Hike Inn make sure you have reservations.