Assume you had access to a 6 by 6 balcony that faces south with a nice railing and (miraculously) endless access to water. Set whatever budget makes it interesting for you. How would you design your garden to produce as much food as possible? Could you produce enough to sustain yourself? How close could you get? What crops would you prioritize?
I go through so much broccoli, onions, and mushrooms so I’d start there. Peppers would be nice, too.
I’d get a fine barn cat, too, to legitimize the whole operation.