Espresso, while in my opinion more delicious than drip, doesn't have as much caffeine as drip (mainly because exposing the water to the bean sucks out more of the caffeine). Espresso has more caffeine per unit, but drip coffee is served in greater volume (thus more caffeinated overall).
Double brewing coffee must make that shit super caffeinated. Watch out though, once you get used to that high level of caffeine, you're going to need stronger things to get that "fix."
Double brewing coffee must make that shit super caffeinated. Watch out though, once you get used to that high level of caffeine, you're going to need stronger things to get that "fix."