Guns & cows
And other self sufficiency/preparedness skills and tech for your citadel. For portability/bug out and ebjoyment add some 4x4 truck/camper and go practice your tech and skills in the middle of nowhere for few days.
Discussion
More looking at tech, not so much ag as I'm already a farmer. Also not really looking at bug out stuff either as I have most of that, but definitely need to run a drill.