I bet if you crossed out the word "soy" and replaced it with "hemp" you could make your own hemp milk with the help of this!

How To Make Soy Milk | eHow.com

Hemp seed isn't cheap, but look around on line. - Granny:hippy:
Storm Crow Reviewed by Storm Crow on . Hempmilk Just the other day I picked up a carton of Hempmilk, which is made by Living Harvest. I'm beginning my experimentation with non-dairy milks so I figured this would be a great one to start with. It's a little thick, sorta has a slight grainy texture to it, but the taste isn't bad. Good things about it: as stated by the company it has all this in one serving 700 mg Omega-3 2600 mg of Omega-6 with GLA All 10 Essential Amino Acids 4 grams of Protein Essential Vitamins A (18%), B12 Rating: 5