That's interesting. You can also use books on public minecraft servers to store basically infinite amount of base64 encoded data for completely free if you already own the game. Besides the cow farm you'll need anyways for leveling and enchanintg you just have to make an infinite sugarcane farm. The most space efficient way is to have the soil pieces arranged in a "Z"-shaped Tetris piece around water sources, but a linear layout may be more time efficient during farming or when automating it.