A couple of days ago I attempted an Anchovy Sauce for the first time, now I do not suggest you take all the ingredients I used but seeing this topic with the research 'on line' fresh in mind does suggest some options.
Tinned Fish in oil, is a concentrated form of both energy and protein, which coincidentally follows the cuisine of pasta, the oil is already flavoured and may have extra such as sardines in tomato sauce. As you are following the SWCP which not altogether wilderness, the natural recipes of pasta with fresh veg and herbs included may well be foraged along the way (talking about shops not gardens!).The oil in the tin is sufficient to create an appetizing mix of a pasta salad.
Also it has been said here that boiling pasta takes 10mins cooking time, I forget the name of the method, but allowing the hot water to soften the pasta after a min or 2 of boiling is a recognised way of preparing pasta without overcooking as is also similar to cooking rice. A carbonara sauce is really egg mixed into the pasta and the heat of the pasta cooking the egg, it has other ingredients but the basic nutrition/protein is the egg, a block of hard cheese shaved with a pen knife as your are travelling light will add flavour and food value.
The shape of pasta are also worth thinking about, tubes and cup shapes are compatible with thinner liquids, fusili I think is good for allowing sauces to coat it giving a good mix for digestion.