- 4 ounces Islay scotch (such as Laphroaig, Caol Ila, or Ardbeg)
- 1/2 ounce simple syrup
- 4 dashes Angostura bitters
- 2 dashes orange bitters
- An 8-ounce flask
- Pour scotch and simple syrup into an 8-ounce flask. Add Angostura bitters, orange bitters, and 2 ounces water, then shake to combine.