I enjoyed my daily latte with the aid of this handy travel immersion heater. It says it's just for water, but I stirred it the whole time it was heating and I had no issues. It worked great and is very portable.
Since I lacked the ability to heat things up, I enjoyed a couple days of charcuterie-type meals.
Breakfast: boiled egg, fruit, and veggies. (+ aforementioned coffee)
Lunches and dinners: Tuna salad + greens,
Not sustainable for a long period of time, but it will get you through a few days.