Lambda Blue: A Mystery

Last night my friends and I tried to figure out the secret ingredient in Lambda Phi Epsilon's signature drink. It's a blue potion that is made out of shots of Everclear and....?
  1. Blue Gatorade?
    Tried this last night. Wasn't the same. Too many electrolytes.
  2. Blue Powerade?
  3. Blue Kool-Aid?
  4. Blue Hawaiian Punch?
  5. Blue food coloring + the Placebo effect?
  6. Windex