If you plan to fly the next day again, have lots of carbohydrates, for example pasta. Avoid fatty food. And also have vegetables, salads and fruits. To ensure all vitamins and minerals are topped up, you can use a multivitamin tablet product. Avoid alcohol in the evening to replace lost liquid during the day.
Alcohol disturbs the regeneration process and reduces the concentration capability the next day.
Same is also caused by a lack of sleep. Alcohol and lack of sleep will result in measurable deterioration of reaction time and less capabilities to concentrate the next day. Which will impact on your performance.