When rice is finished and a bit cool, add it in 1/2 cup measurements with liquid of your choice (breastmilk, formula, water etc.) and puree as needed. (wholesomebabyfood.momtastic.com)
But you just combine protein powder & liquid of choice until a thick frosting happens! (powercakes.net)
1 cup freshly squeezed orange juice or other liquid of choice. (wifemamafoodie.com)