You soak 3.5oz of beans (less than a cup!) in 1-2 inches of water for 8-10 hours. Then it pops into the grinder of the soy milk machine, fill the water to the line, press a button, and in about 10 minutes, it's done!
I added 2tbsp of oats to the soy beans to make the milk thicker, and added about a tsp of vanilla extract and about 4tbsp brown sugar to the water for flavoring.
It came out really well. Very much like the Silk soy milk in flavor, texture, and color, but with a slight bean-y flavor. I hear you can eliminate the bean-y flavor by pulling the skins off the beans, but that seems very time-consuming. So I wonder if there is an easier way to do that. I soaked my beans for 8 hours, and I have some soaking for 10 hours today while I'm away, so maybe the skins will come off easier after a longer soak. But the taste is barely noticeable.
If you like soy milk at all, I'd highly recommend making it yourself. I'm not sure why my mom didn't want the machine anymore! It's super-fast to make with practically no labor. The machine my mom gave me is old, but it works like a dream and I didn't even need the manual.
Cost-wise, it comes out to about $0.67/gallon. If you can find the beans locally, I'll bet it costs less. Cost goes slightly higher if you put in sugar and vanilla extract. Oat cost is negligible.
I'll post photos tonight.