The food and drink at the ground really isn't anything special with there just being a few piecemeal options available that you will find at any football ground in the country such as Hot Dogs and Burgers. My advice would be to either bring some food in yourself – or better yet, hold off eating until after the match and then pick a restaurant and enjoy some awesome local fare, restaurants often are open later in France than most other countries so it won't be hard to find something delicious.

Once inside the stadium, you will find different cafes and small stands with sandwiches, French fries, sweet snack, coffee and beer. There are also some great deals, such as sandwich + beer for 3€, so keep your eyes open.