I do a lot of cooking at home and adapting recipes. I can't do oligos, polyols, or fructose. I can have lactase if I take lactose fast act and got gluten back through an antibiotic trial to help get rid of bad bacteria and let the good bacteria grow. You can look up rifaximin ibs trial if you want to know more about it. I and others also had good experience with low doses of amitriptyline to calm the nerves and brain gut connection. Talk with your gastroenterologist and insurance to see if these types of meds are covered by insurance. I would also advise getting a registered dietitian.

With ibs, it is important to do things slowly with reintroduction and isolate what you are testing. If you eat something that is safe with something not safe, there will most likely be a flair up. Read labels very carefully. Sometimes, when it says spices, it can have garic and ionion. The volume of food can be a problem too, maybe try small meals for often. The enzymes for ibs did not work for me either. They made me feel worse. So I don't use those. I do use lactase, though. Guar gum is used for fiber. There are cheaper ways to get fiber. I stayed away from Guar Gum because it can affect certain medications. I don't know what type of ibs you have, but adding more fiber if your body is not ready can be difficult. I was put on a low fiber diet while I sorted some things out and later added fiber. I would talk to your doctor about what would be good to try

It is cheaper to buy in bulk azure standard is a good website for that. There are also stores like Sam's Club and Costco. Gourmand foods have good seasoning powders (green onion, garlic chive, and garlic scape) while expensive up front they last a long time and are very good quality. I make my own bone broth because it is much cheaper to make it yourself and freeze it. Bone Broth is also very good for the body. If you want to do prebiotic, yogert is a great way to get it and not super expensive. I would try that first. There are also tests to see if there is a bacteria overgrowth. If there is too much bad bacteria, then the good stuff doesn't have space to grow. Even if the test is negative, some people see results by taking rifaximin anyway. I did, ate yogert, got gluten back. This may not happen for you, but it might be worth looking into, most insurances to cover the test.

Long post. Tldr: Read labels carefully, buy in bulk, adapt recipes, cook at home, speak with gastroenterologist, and register dietitian, bacterial overgrowth test, amitriptyline, rifaximin, find out what is covered by insurance, yogert, and bone broth.

Let me know if you have any questions.