Check labels on the canned food - there may be unwanted stuff in there, such as corn syrup or other sugars, MSG, preservatives, etc. (for example, most all canned vegetables are treated with sulfite preservatives to prevent discoloration, but these sulfites are almost never listed on the label because of the lax labeling laws we have in the US...)
Making your own soup at home is usually fairly easy and it likely will taste way better than canned (at least to my taste buds...). Using herbs and seasonings can be helpful, too - depending on what type of soup.
Recipe websites are numerous, and some sites enable you to search for gluten-free or other special diet option recipes.
Chronic Lyme Disease, Chronic Bartonella (clinical dx only), Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, etc.; G-Tube; Currently trying to wean off TPN.
Meds: Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, Milk Thistle, homeopathy.