The hardest word to guess in hangman, according to science, is: Jazz. Composed of 75 percent uncommon letters (J and Z) and allowing only three chances at picking correctly, jazz is the perfect storm of Hangman trickery. It's kind of fitting, really. They say jazz is all about the notes they don't play.
Kickshaw. With only two vowels among a total of eight letters, the jaunty-sounding kickshaw is a reasonable selection for a good bout of hangman.
Its adherents favored simple, clear-cut tunes of folk character that revolved around a central note and moved within a narrow compass, massive harmonies based on blocklike chords moving in parallel formation with harshly percussive effect, and a strong impulsion to a tonal center.
There is a Glacier refill machine which fills either 1-gallon or 5-gallon bottles of whichever brand bottle you put under the tap. It's rather inexpensive also. A new Primo bottle with the old bottle returned is $6.99, while the refill machine charges $1.50 for 5-gallons.
Average Price of $0.35/gallon.