You might want a small plastic tool box that has several screwdrivers and crescent wrenches, vice grip and channel lock pliers, Utility knife, duct tape, electrical tape, a magnet on an extendable rod, measuring tape, small flashlight, needle nose pliers, allen wrenches, a small hammer, a can of WD40 and a can of PB blaster (or similar).
I also carry a cordless drill and a small plastic tray of bits.
Over time you'll add more to the collection.