Breast milk storage??? Please help

Ha
I started pumping yesterday (baby is 2 weeks old) and I got about 3 ounces  throughout the day. I put it into a milk storage bag, and into the fridge. I'm trying to get baby used to bottles since I have to go back to work in less then 4 weeks. 
The milk has separated, which I expected... But how do I un-separate it to use it for feedings? Also, can I combine today's pumped milk with yesterday's?? Since I'm not getting a ton yet....

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