Dairy and egg allergy

So my 1 yo is allergic to dairy and eggs which was confirmed at our recent trip to the allergist. They didn’t say which part of dairy, just told us to avoid EVERYTHING. The list of ingredients that are considered dairy are literally in everything. Anyone have any tips or experience they can share? He does like the dairy free yogurt, but even like veggie burgers have milk in them. Any certain stores have more dairy free options?