Help! Milk storage

Thaydene • Wife and first time mother to my little monster. Baby boy born on 12/7/15: the day my life began 💙 thank you God 🙏🙏
I'm EBF my son. I have a 5 day course coming up and I needed advice on how to store his milk. The course is from 8-5p every day...I won't have access to a fridge and it'll be hot outside (July-meaning where prior, milk could have survived a little longer outside with an ice pack). How can I store his milk? Any advice will be helpful! Thank you ladies