Recipe: First, buy your blender - don't bother with the cheap and cheerfuls, you need something like [this one, aff link here] because of the high power required to grind the things. You'll need an entirely separate set of kit because you won't like curry spice flavoured nut milk on your cornflakes. Order a nut milk bag. Buy far more nuts than you would ever normally have in about five years. And rice. And oats. And a water filter, because hard water tastes absolutely rank. And some sealable bottles to store it in. And a pan big enough to sterilise them in. And some vitamin & mineral additives. And some oil/other stabilisers. And sugar.
Now you're too skint to spend a pound on a commercial carton, learn to drink your tea with (bottled) lemon, your coffee black and put the assorted paraphenalia into the back of the cupboard where it belongs.
ETA: Glad he's alive. That's a huge amount of food, though. I'd be worried about attracting mice with that much, seeing as most rabbits end up with lodgers at some point.