There is an interesting youtube channel called 'Townsends' that centres on 18th Century food and covers British and North American stuff, it often involves food for keeping and also for journeys.
If any have a particular interest in the naval side of things. 'Feeding Nelson's Navy' by Janet MacDonald is a very good book indeed. And it really brings home the rather obvious fact that, because of the huge amount of physical exertion required by sailors of that time, the food supplied by the navy was in fact both very good and plentiful. (the merchant fleet was sometimes a different story...)
As with so many other historical matters, we shouldn't think our forebears were either stupid or tasteless; hard tack / ship's biscuits have received a pretty bad press, but they were - and are, I've made them - pretty good when made, stored and eaten in the correct way.