We have a formula dispenser so it's easy. It has three sections for pre measured formula. We put two scoops of powder and a little cereal for DD's reflux in each section. Then, we have 3 bottles with 4oz of room temperature water ready to go on the night stand as well. In the MOTN, I reach over, open a bottle, dump in the pre measured formula, shake, and feed.
I have 2 dispensers ready to go all day and prefill all of the bottles with water. She never has to wait long for food.