One of my secret weapons: a bit of instant coffee in the water bottle. Cold brew of champions.
Am mulling, though, in the manner of Luke switching off his targeting systems in the event, following the LDS prohibition on "hot drinks." i.e. caffeine. Unclouding the mind. The warning o hot drinks should be contextualized -- 19th c. canteens, there's no telling what was in those beans, as Gurdjieff pointed out.
One reason for this is something I noticed during the blizzard last week. Given the weather, I relaxed the firm parsimony, and went to sbux a few times, where the coffee is more potent, caffeine-wise. The lift was rewarding and familiar, but I also had a sense that the ladders of the evening (it was morning) were the cost of the present energy. Antaeus lifted from the earth.
Of course, the second test will be whether I can stay awake all day. In prior spells of adversity, the record was five days without real sleep (I think). Almost, Gilgamesh.
Update -- this will have to be a gradual reduction, else I will likely go mad an instant before my head falls unconscious onto the keyboard in front of me. A solid ambition, though.