Is sugar really necessary in making Soya milk ? I do not think so. We should try to avoid sugar (particularly the refined white one) as much as possible. I have been preparing soya milk from soya beans in a machine for a year now and have never added sugar. When using the milk we add chocolate powder or an instant cocoa.
I have used the same recipe many times. It can be difficult to do very often but the results are great. I use aQ'Tessence automatic soymilk maker now and it makes it a lot easier. http://www.qtessencesoymilkmaker.com
I made soy milk for the first time last weekend. It is pretty time consuming and whether it is worth the effort if your local shop stocks the stuff is debatable. However if you don't have access to good bought soymilk then this is a very easy recipe. Better than el cheapo bought stuff. I also tried sweetening some of it wih maple syrup which works well.