You'd be amazed how little space two weeks of food actually takes up when all is said and done. It is water that is bulky. Store what you eat, and rotate it.
It's the rotation that's the problem for me. It's easy enough to stash food in little obscure hidey-holes, but if I am to "store what I eat, and eat what I store" then it needs to be accessible so I can do that. I currently store 3 times as much tinned sweet corn as tinned carrots, because the corn comes in plastic-wrapped packs of 3 tins so it's easier to move around and stack. The carrots are individual tins; if I stack them it becomes to hard to get at the bottom tins, and I need to do that whenever I buy new.