changing from formula to milk help!!

So my daughter will be one at the end of this month she takes 2-3 4 oz bottles of formula a day (one in the morning, one at nap and one before bed) how do I transport milk during the day when were out and bout without it spoiling. Also should i switch to put it into a sippy cup to eliminate the bottle? Is it bad I dont give her any juice? Help me out mommas