Well, first thing i would do is A, Buy a water purifier/grabber that grab's the water molecules from the air and makes water without you having to search for it, Second thing i'd do is live underground in a bunker till the radiation clears, With my waterthingy rigged aboveground and purified water below ground, With a few family and friends. Like a vault. After that, prehaps search the prewar ruins of city's and maybe starting up a civilization of myself.