The only thing you really need it your brain and skills to survive, but a good knife will be a big help, as will be someway to start a fire, and something to cook in is always nice. Hard to know just what you are looking for, as don't know what you want the kit for.
Is it to be a bug out kit or something like that? Or just something to take with you on a day hike?
Is it to be a bug out kit or something like that? Or just something to take with you on a day hike?