Hi, BigD68 - We come to the foremost vaping forum on the planet and an unrivaled wealth of DIY information, none of which will be found in this post. Bathtub gin isn't called that for an obvious reason. According to Wikipedia, "As
gin was the predominant drink in the 1920s, many variations were created by mixing cheap grain
alcohol with water and flavorings and other agents, such as juniper berry juice and glycerin. Because the preferred sort of bottle was too tall to be topped off with water from a sink, they were filled from a bathtub tap."
So, FlavourArt makes as convincing a gin flavoring as you'll find. Just add water. Plus VG and PG. From the tub, of course. A drop of liquid soap might add to the authenticity but is likely a really bad idea.
It's just gin.