Food Allergies Treatment

My grandson has a severe food allergy to tree nuts (not peanuts). Many cake mixes, snack products, and prepared foods are made on equipment which also processes nuts. We cannot use those products. Can anyone with similar experience suggest some prepared snacks or mixes that are safe?
He would go into shock and having breathing difficulties which could threaten his life. It is very dangerous!

I broke out the other night, I believe from drinking some bombay which uses almonds as one of their ingredients. What sort of alcoholic drinks should I stay away from when I go out??? Thanks! You’ll save my life for a later date