What supplies should I bring for my camping trip?

I intend to go camping next year, for multiple weeks, during winter in Mississippi (my home town), when it's nice and cool out. I will mainly walk all day through the woods, and sit down and sleep at night, at a somewhat random spot. This means I'd sleep, eat, walk through, and be in unpredictable terrain- clear, grassy fields, muddy swamp areas, woodlands, etc. I will have a friend along with me. I was hoping someone could help me, I need to know what supplies would be important to bring. Example- what kind of sleeping supplies, what kind of food, and tools, and etc I should bring along with me. And, of course, consider emergency supplies, if something is to happen, and the trip takes longer than planned. I'd like to be fully prepped. And, if possible, can I order it online? I prefer to order online, but I could easily run down to Wal-Mart, or some other store. If I can order online, please do provide a link. In advance, I appreciate your help.