You might want to kill me after I say this, certainly people on HN want to kill me just for fun ;), but I also drink coffee. I only drink sugar free Red Bull. What's strange is I can stop for months without any withdraw from caffeine. I often go from drinking Red Bull + Coffee for a few months to just water for multiple months.

Once I finish this case, I think it's time to go back to water and coffee for 6 months. :)