I cook large servings of the foods I can eat and freeze individual servings that I can carry in a cooler when I'm on the road working or even working at home. My favorite recipe for this is a chicken/tomato/mushroom stir fry thing, only three ingredients. I cook and freeze individual servings of brown rice.
I also carry 100 percent brown rice cakes and 2 percent cheese, as well as individual bottles of milk ... have used 2 percent milk for awhile as it has a lower glycemic index (better for blood sugar) but have decided to go back to the fat free. I eat 100 percent natural peanut butter by the spoonful, as well as 100 percent natural almond or cashew butter. Occasionally, I eat lean beef, stir fried with plum tomatoes and mushrooms.
If I am having a low blood sugar episode and there's no food and I'm on the road (I try to see to it that this never happens, but ...) I can stop at a convenience store and get a cheese stick with an apple or pear (if they have pears, which seemingly they rarely do). I also like grapes a lot, but again they are somewhat high on the GI so I always have some kind of protein with 'em ... I like a snack of grapes and milk (not mixed together, of course)!

Sometimes when in a different town for work, I go to the grocery store and get something like an individual carton of cottage cheese (fat free WITHOUT maltodextrin in it) and some tiny plum tomatoes ... I like this with red pepper flakes ... also available in the grocery store.
Besides tuna (sorry to mention tuna), I get individual pouches of salmon ... they have albacore fillets in those pouches now as well ... I had a problem with one, but seems ok for me to eat 'em now ... there is also Uncle Ben's Ready Rice in a microwavable pouch ... they have one that is 100 percent brown rice, precooked, but it's not instant, has a dab of canola oil in it ... I sometimes mix this with, er, tuna in a throwaway bowl and microwave. I also make smoothies and soups in individual sizes out of fruits, veggies, etc., in the Magic Bullet mini blender. I eat only 100 percent whole grain bread, current favorite is called Kamut something or other ... made from kamut and totally sweetener free. I like the Westsoy UNSWEETENED soymilk line in chocolate, vanilla, almond and plain ... no sweeteners of any kind.
I like eggs and also omelets and things made with Eggbeaters.
Hmmm, there must be other things that I eat as well, but that's close to it!
On and off, I do break down and eat something that's not low glycemic, but that's getting less often.