Nikon FM2n with 35mm ƒ/2 and 105mm ƒ/2.5, however many rolls of B&W I have in the apartment (Edit to add: 11) (and probably whatever is in overpriced stock at the Ritz Photo on B'way), the spare powder developer and fix (the previous would all fit in my photographer's vest, the following would be in that and my messenger bag), pictures of girlfriend, salt, sugar, cumin, tarragon, turmeric, matches, notebooks (reporter's and regular), pens, Macbeth, Paradise Lost, US Constitution & Declaration of Independence & Articles of Confederation pocket edition, passport, rice, kitchen knife, scissors, bowl, fork and spoon, the very small pot and lid, binder with empty negative holders, measuring cup, duct tape, thread and needles.
Only thing I don't have that I'd like to is a lifestraw, but they're awaiting FDA approval. Well, that and the chance to get a proper party together.
Note: Someone may attempt to trip me up by asking where I'll get batteries for the camera — the camera is entirely mechanical.