Probably not going to get sick, as long as it's sealed.
I've left milk in my car from the afternoon to the next morning, and it was okay to drink.
I'm fasting in Ramadan so I can't eat school lunch but they say I can take it to go in a small box to get it home. But is it ok to drink my chocolate milk when it was heated in my book bag and freeze in my refrigerator to drink or am I going to get sick?