Breast milk care/storage


I’ve read what I’m supposed to be doing, but I’m curious, what are you moms doing in this situation:

Milk was pumped into bottle and put into the fridge

Bottle was warmed, and baby drank from it for 15 min

There are 3 ounces left.

Do you all toss it or does anyone put it back into the fridge and use it for the next feeding?