Or add to the holistic book list in Health & Healing. Recommended Books
Why Stomach Acid is Good For You by Jonathan Wright, M.D.
Great book! Without enough stomach acid you can't digest your food properly. Also, stomach acid is needed to stimulate your pancreas to release digestive enzymes. Without proper digestion people get food intolerances, candida and/or bacterial overgrowth, etc. The book covers it all, from causes, symptoms, to correcting the situation. Many people think they have too much stomach acid, when in reality they don't have enough.
Both of these relate to ana food allergies (the peanut-specific one has solid overall allergen management info):
Both have, among other things, comprehensive explanations of the whole cross-contamination issue, as well as explaining reactions and how to respond to them. And they repeat the magic words: carry epinephrine.
My boys' allergist has gone to presentations by the author of the first book, and she also recommended the second. She is so scrupulously careful and supportive of my kids' situations . . . I'm really comfortable recommending anything on her say-so alone but have read and like the two I mentioned here.