Calpis is a popular Japanese yogurt drink that has a unique, slightly sour taste. It is often described as refreshing, cooling, and low in calories. There are a few synonyms for Calpis that you may come across, such as Calpico, Calpico Water, or Calpis Water. These are all essentially different variations of the same drink, with slightly different flavors or consistencies. Some people might also refer to Calpis as Yakult, which is a probiotic drink that is similar in taste and texture. Other potential synonyms for Calpis could include yogurt soda, probiotic beverage, or cultured milk drink. Ultimately, each of these terms refers to a similar type of drink that is popular in Japan and beyond.