We rarely leave the bitumen so supplies aren’t such an issue. All around Australia most towns these days have good supermarkets and I’m sure that even if our fridge/freezer broke down we’d still have enough food on board to keep us going for quite some time.
Pasta, rice noodles, canned soup (there’s nothing better than soup on those cold wet nights when you are too tired to cook), rice (short grain and Arborio of course because Woody loves his risotto), small cans of tuna for lunches, sandwiches and salads. Tubs of tomato paste and bottles of passata. We always carry a few packs of dried peas to satisfy those childhood cravings (to us Surprise Peas = Camping) but when it comes to other longlife vegetables we choose canned. Corn, champignons, asparagus. Yes, I know some people will say “tut, tut but what about the weight?” but weight really isn’t such an issue as we only carry enough to keep our meals interesting.