I'll avoid perishable food where I can. Hard cheese should last a while. Jam or honey, biscotti or hardtack, dried fruits, potted meat, seasonings if they're affordable. Otherwise the things Eliot was asking about earlier in the week like clothing and alcohol, maybe some basic weapons or whatever tools look like they could come in handy. I wouldn't mind some tools for making quick maps of places we end up, either. Compasses and calipers.