Traveling with breastmilk?

So I’m 2 weeks pp and my family and I are going to DC for the day tomorrow and currently I am bottle feeding breast milk. I have no idea what to do, do I just pump with my haakka every time she’s hungry & give her that or bring my supply I have in my freezer and find somewhere to warm it up? Won’t it go bad if I do that though? I am just so lost on what to do and am freaking out.