I would advise some sort of spare cooker-even if it is only a small screw-on camping gaz one...contact adhesive for all your sailrepairs,a sewing machine for all the extras that you will need to make as it gets hotter,and a full set of taps and dies and some threaded rod for all those seized fasteners that you will have to bust out.
It is not possible to have too much epoxy,sikaflex and duct tape imo with which to improvise repairs...
I love the mantra 'if it breaks and you can do without it,sling it',thus your boat gets simpler,lighter and cheaper to maintain. From experience I refer to inboard engines,wcs,pumped water systems,electronics and refridgeration.
But then I be a bit of a sailing luddite on 'ere!

Seriously the one thing that would worry me most would be breaking the gooseneck and or roller furling drums,furling lines and swivels..