You can truly use any gin you like! I always like to support local distilleries, but if you don't have that option (or just don't like what they're selling), I always suggest: Sipsmith London Dry, Tanqueray London Dry, Bombay Sapphire Gin, Hayman's London Dry, Monkey 47, Beefeater London Dry, Gray Whale, or Botanist Islay Dry.