I've been making hemp milk for quite some time now and here is the recipe for it. Note: you will need a very powerful blender such as a Vita-Mix for this recipe. Also a large bowl and milk filter bags. You can get the bags online if you do a search for them.
1 cup hulled hemp seeds
7 cups of filtered water
raw honey or sweetener to taste
pinch of sea salt
Fill your blender with the 7 cups of water. Add the hemp seed, vanilla and sweetener. Blend until all the seeds are broken up. When that is done let it sit for a few minutes, then blend again.
Filter through two milk bags into a large bowl. Put into a glass container. The container should have a tight fitting lid because you have to shake the milk up before using. Also be aware, this goes bad very quickly so use it up within two or three days.