Your best bet is to bring your own snacks. Most ‘snacks’ are treats not really snacks
At ts meals sub veggies for starches. Skip dessert. Sugar free is not Keto.
At qs, skip the fries. If there is a toppings bar, load up on the lettuce and skip the bun and fries
I don’t know what is in the scrambled eggs, but I would skip them. Stick to whole eggs or even hard boiled eggs.
I would make a plan for meals for every day. Where do you want to eat. What is a great option what is a ok option. If there are no ok options, make a second choice. You can also ask for protein to be prepared simply w butter and not a sugary sauce
It is complicated. It is hard. The temptations will be everywhere! Your husband is smart to try keto vs what a standard diabetic nutritionist will suggest. The standard ada diet is horrible for diabetics. Everything in moderation is ridiculous. No one tells someone w a peanut allergy to just eat them in moderation right? Diabetics can’t handle carbs. Period.
You will have a fridge (right?) get stuff delivered.
Hard boiled eggs
Precooked bacon (food courts have microwaves)
Jerky if you like
Nuts
Hard cheese
Cured meats
There are diabetic sites low carb high fat. Stricter than Keto typically but it works so well!
Is your husband eating to his meter? Best way to find what spikes him.
Best of luck and enjoy your trip!