Thanks for providing additional information.
I understand your concern and it's my pleasure to help you in every aspect.
Firstly congrats for your son's marriage and have a happy married life.
Now he should take some self care measures while travelling like-
Eat frequent small meals(4-6) throughout the day.
Drink plenty of water.
He should drink 1 or fewer alcoholic beverages a day (1 alcoholic drink equals a 12 oz beer, 5 oz glass of wine, or 1 ½ oz distilled spirits (vodka, whiskey, gin, etc.).
Drink alcohol with a snack or meal.
Some good snack ideas are pretzels, popcorn, crackers, fat-free or baked chips, raw vegetables and a low-fat yogurt dip.
Check the carbohydrates levels in different types of alcoholic drinks.Link
Avoid drinking when blood glucose is already low or when stomach is empty.
Try wine spritzers to decrease the amount of wine in the drink.
He should keep a well-wrapped, air-tight snack pack of crackers or cheese, peanut butter, fruit, a juice box, and some form of sugar (hard candy or glucose tablets) to treat low blood glucose.
Wear comfortable shoes and never go barefoot.
Also it's good to keep a glucometer to check his blood sugar levels at different times.
For further details regarding travelling - link
It's advised to check his blood sugar levels before travelling as well.
Hope this helps.
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