My wife and I recently got back from a 3 day trip out of state, and I am happy to say food was not an issue!
With any trip come the stresses of the pre-trip preparations... Did I bring all necessary identification? Do I have enough cloths? Will my toothpaste, sunscreen, face lotion, shampoo, and whatever else fit into that annoying 1qrt bag? And if you are one of the "lucky ones" living with a food allergy, what about food?
For this trip I decided to do something a little different, aside from packing some essential soy/dairy free snacks (and lunch for the airport of course), I decided to do a little Google searching for organic food markets in the area where we were staying. To my surprise I found a great health food store, with a juice bar, that resembled a similar store in our home town that my wife and I frequent weekly; so much so that it made food shopping for meals and snacks stress-free!
So before you travel, while you're on the internet searching for the cheapest plane tickets and best deals on a hotel or rental car, take a few minutes to search the area near where you will be staying. Food-wise the more "at home" you feel, well, the better you will feel!