I was on Phase 1 again when I was flying enroute to my parents' home. I found that hard boiled eggs were an excellent food choice, as was pre-cut veggies but put in securely wrapped containers (water proof). It is so easy to find diet soda or bottled water as you are traveling. I lucked out and the airlines I flew had peanuts instead of pretzels as the snack choice. It worked a lot better than I thought it would.
With the summer heat, I am a little leery of doing mayo camping. I guess, I would stick to just keeping the bottled or canned beverages in the cooler with ice. No matter how good they say they are, they usually leak or "perspire" moisture and even though water is harmless, it can still make things soggy.
However, you can have a lot of delicious grilled lean meats and vegetables when you are grilling out. The grilled smell and flavor really add to the taste, I think.
Phase 1 is definitely do-able camping. It was for me when I was traveling on an airline although the chef salad I bought in the Memphis airport was overpriced and dry. The Bar-b-que though smelled awesome---boo-hoo I only could sniff!