You can't prep them ahead of time as it will get really. Clumpy. You can put the formula and rice in a bottle and just wait to add the liquid.
Great thank you! So middle of the night feeds will be so fun now ;)
we have the water measured out already in the bottles and have the formula w/the cereal mixed into it in the Munchkin dispenser and it makes it so much easier for middle of the night bottles. http://www.amazon.com/Munchkin-Powdered-Formula-Dispenser-Colors/dp/B0009ET94A