I'll post some home-made granola recipes later. It is so easy, you will scream at the prices you have been paying for granola - no matter how cheap you thought it was wholesale.
Let's see, you were thinking of grinding up granola (mostly oatmeal), mixing it with honey and, I assume, water. And drinking it? That is grotesque. If you are the kind of guy who can drink raw eggs for the nutrition, then this may also be a concoction for you.
Try it, though, and tell us how it is. You are only a blender whirl away from knowing for sure.
Look up a couple recipes for modern man's version of pemican. The original stuff was made with tallow, dried beaver meat, and dried fruit. Leave out the beaver and tallow and you have dried fruit. Hmm, there must be some substitute for those two ingredients.