question: I pumped probably less then 2 Oz of breastmilk, so to create one full bottle can I mix…

question: I pumped probably less then 2 Oz of breastmilk, so to create one full bottle can I mix what I pumped today with what I pumped yesterday? I have to get up early in the morning & I all I really need is one bottle but I don't produce enough as it is so I take what I can get.