A vendor supplies a half liter of milk daily. Some times, due to variety of reasons, I arrive at a situation that I need to handle milk of 3 consecutive days i.e., 1.5 liter.
Elder and experienced members of my family asks me to deal each 1/2 liter of milk differently. But, they fail in providing a valid reason for not mixing them.
Is there any issue with mixing milk of different days and use them for my purposes?
Note that the milk is not too old. All the individual milks are edible.