How Do They Flavor Seltzer?

How Do They Flavor Seltzer? Natural Flavor: Flavorists create natural flavors by using ingredients from natural sources such as essential oils, extracts, etc., that are derived from spices, fruits, vegetables, barks, and other natural sources. What is used to flavor seltzer? Single-flavored seltzers often include more than solely the extract from one fruit; a grapefruit