Treat diet as a hard constraint
Suggestions that 'probably have options' are how travellers end up at a supermarket. A dietary requirement should filter the list, not sort it — which is how Googjet treats halal, vegetarian, vegan, gluten-free and allergy constraints.
Anchor each day around one certain meal
Confirming one reliable, verified meal per day removes most of the daily stress. The other meals can then be opportunistic without risk.
Learn five words, carry one card
The names of your allergens in the local language, plus a written card, resolves the majority of restaurant misunderstandings — especially where allergen labelling is not mandatory.