I've seen low-carb crustless pizza, low-fat cheeseless pizza, why not freeze-dried Astronaut Cheese Pizza? It's crunchy, portable and ready-to-eat, no rehydrating required. It's the same stuff they've been selling at the Air and Space Museum for decades, as the "food of the future".
Funky Food Shop has the full range of space snacks including ice cream and strawberries. Also available are super caffeinated Turbo Truffles in flavors like Cosmic Coconut and Toffee Tornado.