Making up bottles

[JWandBump]

I used to make up about 3 bottles for my DD when she was a baby but I've been told to only make up one as I need it. For me this isn't very realistic especially in the middle of the night.

So far I've been using cartons but I need to use powder now as its costing to much, so can I still make up 2-3 a time and store them in the fridge ready for later?? Thank