The bottles/bidons can be filled with: (cold) drinks such as fruit juices, thick juice, milk, yogurt drink, ice cubes (then it stays nice and cool) or pieces of fruit (such as a slice of lime). With dairy products, however, it is important to clean the bottle well afterwards, especially the cap. We do not recommend putting carbonated beverages in your bottle because a lot of shaking or movement can increase the pressure. In addition, with water bottles, the inside can become discolored from beverages other than water.