Primula cheese and oatcakes has saved many a lunchtime for me.
How about you make a big pot of chilli for the weekend - it's hard to get wrong. You can prep it and then let it simmer away while you get shelter sorted. Have it with rice or thin bannocks if you want something to mop up the juices. Good thing if you're not too sure about cooking meat over a fire is you can do a veg chilli or your can brown off some mince the night before and stick it in the fridge in a snap-lock (for the good seal) tupperware type box till you head off. Provided you keep your chilli pot in the shade, protected from insects during the day and get it back to a good boil when you're heating it up it'll be fine for 2 - 3 days.
If you were going to be hiking in warm weather for an extended period I'd be tempted to freeze the cooked mince and let it thaw slowly over the journey, wrapping the frozen container in a towel to insulate a little and absorb any moisture. Because you will have cooked it already you don't need to be quite as careful with the thawing and cooking afterwards.
For a chilli for 4 for 2 days, I'd take (and by that I mean get everyone else to carry) ...
at least 500g of minced beef, more if you're big meat-eaters - pre-browned in the kitchen, sealed away and in the fridge - keep the juices for flavour
1 big onion - you may like more
1 large box of mushrooms - saver packs are good, cheap and ugly but you'll be chopping them all up anyway
a couple of big courgettes
2 tins of kidney beans
4 tins of chopped tomatoes
3 or 4 beef / chicken or veg stock cubes to be disolved in a pint of boiling water
fresh or dried chilli to taste
1 bulb of garlic; peel, crush/chop and add all of the cloves
salt and white pepper, again to taste
veg or sunflower oil - need at least two tables spoons worth.
Optional ...
flour mixed into cold water to thicken up the chilli - don't add too much or you'll make chilli flavoured glue - a tablespoon of flour in a cup of water and add two teaspoons worth at a time mixing thoroughly with each measure, the trick is to wait until the very end and then thicken up as necessary.
adding butter too will give a very rich sauce.
For that extra touch ...
a bag of pre-grated cheese for topping
2 bags of flour tortillas (allow 2 each per day
) - you could try making your own with just plain flour and water and a dry frying pan
a bottle of tabasco - there's always one who wants it volcano hot - usually me - heheh
I'd do tortilla or bannock as rice is messy to cook, unless you go for microwave rice and boil it in the bag (sealed) or take those easy cook bags but even then it takes up a lot of your water which may be needed for drinking.