Preheat a panini press or a grill pan over medium heat.
Assemble the Panini: Spread mayo and mustard on the inside of each piece of bread. Layer with turkey, apple slices, and brie. Top with the remaining bread slice.
Grill the Panini: Place the assembled panini onto the preheated panini press or grill pan. Cook for about 3-4 minutes, or until the bread is golden brown and the cheese has melted.
Mix the sparkling water and lemon.
Serve the Meal: Cut the turkey panini in half. Serve with chips, pickle, and lemon sparkling water.