FTM question

I'm planning on breast feeding, and I'm going to buy a pump and such, and then if I produce enough store it, right? So do you freeze it? And then how do you warm it up? What do you warm it up in? I know you can breast feed without a bottle, but I'm talking about when we go in public and such. I have decided I don't want to breast feed in public, just a personal opinion, I don't mind seeing other women do it, I just don't want to. So how did you guys do it?