Vimto say they're gluten free, according to their website. https://www.vimto.co.uk/faqs/does-vimto-contain-gluten/
'There may be a very small amount of gluten which carries through from the barley malt during manufacturing. But, the level is so low that it wouldn’t be considered to contain gluten (20 parts per million). So, Original Vimto is classed as gluten-free, while our other Vimto drinks flavours are completely free of gluten'
Vimto syrup as sold in ethnic shops (particularly for Ramadan) in glass bottles - it's very popular in Saudi Arabia - is specifically stated to be totally gluten free. https://vimtoarabia.com/faqs/ . No artificial sweeteners, either, unless you pick the zero sugar version.
Knorr and Kallo make the best tasting stocks outside doing them yourself.
You might find that you've also been lactose intolerant due to the damage done to that part of your gut. Lactose free milk is great and the stronger & harder the cheese, the lower the lactose.
Most bread substitutes are an exercise in disappointment. Pasta is better, Garofaolo does reliable versions and the one with Teff is very similar to wholewheat pasta in texture, colour and flavour. And a potato is always gluten free - with some GF flour, you can do potato scones and nobody can tell the difference.
Buying Tamari (and checking the ingredients) in a big bottle online is far, far cheaper than buying coconut aminos or gluten free soy sauce.
Rice noodles are great for the 'pot noodle' type of snack - boiling water, stock cube, noodles, add your choice out of frozen peas, edamame, sweetcorn, diced tomato, boiled egg, peanut butter, chilli, prawns. You can have most types of miso (but always check) - but have to be very careful checking gochujang paste/korean food, as it often has wheat in it.
Because you can't just go to a shop and be guaranteed to have something safe, get some snacks in the cupboard and fridge and stock up on reliable staples.
Oh, and if anybody here hasn't noticed - you know that Heinz baked beans and sausages are no longer gluten free because they've switched to Richmond? Well, they clearly aren't being particularly careful with their non-sausage beans either, whatever they may claim - I had a full blown gluten reaction to plain and ordinary Heinz baked beans a few weeks ago (definitely those because I hadn't had anything else all day and the reaction was almost instant).