Breastmilk storage?

I've been breastfeeding my lo and finally decided to put my pump to use about an hour ago. I, surprisingly, got 5 oz in less than 15 minutes. I put it in the fridge for now... But like how long can I refrigerate it for before it goes bad? And what do I store it in, because at the moment it's in the bottle that came with my pump. :/