Sounds like you've got everything but the food. I'm not sure if I'd include a crossbow, but if you can get one with a collapsable bow or store it broken down, it might be worthwhile.

I know the German army uses something like our MREs. Can you get them? Dehydrated camping food? Those for one solid meal per day per person, and Datrex rations (those are from someplace in the EU IIRC).

Even though you are on an engine, I might suggest a flat or 2 of half-liter water bottles. At least innitially, they might be more convinent.