A sterile filling method for an additive product container defining a product chamber adapted for containing an additive product can include forcing a first gas at a first temperature into the product chamber over a first threshold period to heat the product chamber to a first threshold temperature, such as to sterilize the product chamber. The sterile filling method can further include dispensing the additive product at a second temperature into the product chamber, sealing the product chamber; and, rotating the additive product container from a first position to a second position, such as to bring the additive product into contact with a sealing member sealing the product chamber.