I have always had in mind that a tool kit is useful to carry.Most important though in our case is to carry tools that you actually know how to use them.
In my case my kit is minimal and is according to my knowledge on the car.Bellow I am giving you a quick list of must have tools.
Emergency Kit & Fire Extinguisher
German wrench 12 – 13 mm
Wrenches 8, 10MM
Polygon 24 mm
Handle for Sockets
Socket 8, 10, 12, 13, 14, 17, 19, 24 mm
Small screwdriver Philips
Keys Allen 1, 2.5, 3, 4, 5, 6, 10 mm
Battery jumper cables
2 clamps 9 – 19 mm
4 meter cable Thick
0.5 meters fuel pipe enhanced
Various screws, nuts, washers