I used rice water; I let my rice soak overnight, then drained off the water to use with the lye (which became almost a gel). Then, I cooked the rice until it was mushy and blitzed the rice, with some of the cooking water, until it was smooth. I added about 25 grams of that slurry to my 1000 gm batch. I also added 1 Tbsp of rice flour. Incidentally, I only cooked up 1/4 cup of rice.
So you add rice water and rice slurry as the lye water. And 1 table spoon rice flour in the oils?