I would choose a food high in moisture, high in protein, moderate in fat, and low in carbohydrates. Freeze-dried raw is great and it does not require refrigeration. Just keep the bag sealed with the zip closure. Simply rehydrate and serve.
Here is a great resource: Lisa A. Pierson, DVM CatInfo.org
I like both of these brands.
Vital Essential Freeze-Dried Entrées
Stella and Chewys freeze-dried raw dinner morsels
Avoid dry food especially for male cats because of urethral obstructions.