Most of my recipes are 'make it up as you go along type' meals. Most of them start in a similar way. Fry an onion, add the other veg, add the herbs and spices or sauces. Add the cooked rice/pasta/noodles/lentils/cous cous/protein. Add things like fresh herbs/garlic/lemon last. I tweak the recipes each time I make them so they taste even better and I'm never scared to throw in other things. I don't follow recipes because I like meals to be slightly different every time, I get food boredom easily. When food runs low people will need to be more inventive and adaptable and not stick to set recipes.
Learn a basic bread recipe (half a bag of flour, packet of fast yeast, bit of sugar and salt, 300ml warm water), then you can make every kind of bread, sweet bread, buns, pizza, flat breads, naan etc.
Learn how quick and easy it is make pastry (flour, fat, salt, water) and use this for pasties, pies and quiches, pies.
Basic cake, cookie and brownie knowledge will also be useful. Basic white/cheese sauce recipe is also useful.
I appreciate most people know how to do this anyway. But for those that don't already know, the next month would be a good time to start practising.