Here is a good video from about three years ago with the Saxo Bank cycling team. Its shows some of the riders on the bus along with team boss Bjarne Riis. What is interesting is this one little trick that might be overlooked. The team soigneur mentions that they always set up at the end of the feedzone so the riders know where they are located.
The video shows some of the energy bars that are found in the mussette. Their bags included the full range of commercial products with energy gels, energy bars and protein bars. They also include some homemade products. The end of the video includes one overlooked item, the restocking of the team car with product. The team cars usually run out of water bottles on hot days.