Each scoop have equivalent amount of boiled water (mls). You need to deduce the amount of mls your baby can finish per meal so it won't be going to wastages. Depending on your baby's age, you can start with 60mls of water and 2 scoops of milk or 90mls of water and 3 scoop of milk. So you can increase as the baby demands more quantity

It depends on the quantity...I use three scoop per meal

I also use 2 spoons