I am think (with no evidence) that initially we will see empty shelves and then we will see a return of some products. Hopefully shortages of staples will be short lived and much more seasonal after that. Therefore I am working on having the things that transform a bag of flour into a wider variety of things than a poorly risen loaf of bread. Our prepping is based on making self sufficiency and seasonal shortages more bearable. We don't have enough room to store a long term supply of food that is based on how we eat and cook at the moment so we will have to adapt if it drifts on.
We have been doing inhalers and OTC medicines, the spice cupboard is well stocked (if I am reduced to eating swede it is going to be a tasty swede), cereals (not breakfast ones - flour, pasta, barley, etal), dried legumes (beans, chickpeas, lentils, split peas) Sugars, oils and stable fats - esp olive oil (some things I can't live without). Condiments and specialist cooking ingredients - tasty swede syndrome (soy, miso, fish sauce, MSG, citric acid, vinegars, raising agents, tomato puree - I see you sea). Preserved tasty things - dried fruit, nuts, jars of ante pasta. Dry goods - bog roll, tampax, soap, shampoo, washing powder , bo spray, sugar soap, dishwasher tabs, washing up liquid, bleach, plastic bags, foil. I have also stocked up on tinned tom, butter, cheese, chocolate, cocoa. With the best will in the world I am not going to eat tinned stew - unseasoned swede holds more appeal.
We are fortunate in that there is an egg farm, grass fed dairy farm, hills sheep farming and local abattoir and spring water all within cycling distance. So the bike bits are being sworn at less and cleaned and carefully put away. I am helping my mum build up her wood store, we are fixing the fences on the fields (so we can swap grass/ grazing for end product) , buying in extra water filters, Making sure the seeds I buy are not hybrids, making proper compost bins, nails, string, screws and sewing thread are all carefully tidied away and cared for rather than randomly thrown in draws.
I may be overthinking this.