Soy bean vs soy milk math:
- I buy 4 lbs (1.8 kg) of dried soy beans for US$6.99
- I use 4 oz (0.11 kg) of dried soy beans each time I make soy milk, with 32 oz of water (0.91 kg).
That gives me 20 oz (600 ml) of soy milk after straining through a cheesecloth or yogurt strainer.
That means my cost for making 20 oz of soy milk is $0.43, plus the cost of electricity for 30 min and water. And my time. After I got a soy milk maker, I make it much more easily.
I used to buy freshly made soy milk from a Vietnamese Chinese restaurant in the Tenderloin for US$12 a pint. My mom freaked out and got me to learn how to make it myself. :)
I don't like soy milk that's sold in American grocery stores, especially the ones replacing dairy milk. They just don't taste right (or good) to me.