Day 3: Unknown Armies
Bottled Summer
This dark bottle bears a handwritten label with a simple sketch of the sun shining down on a hilly landscape and identifying its contents as one day of summer of 1982 vintage, 62% sunshine content, bottled in the department of Var, France.
Up to one day of an exceptionally warm and sunny summer can be poured from the bottle, though correctly portioning it while pouring can be a bit difficult and the rest of the summer will quickly evaporate if the bottle is not corked again after pouring. If this dramatically changes the weather, it forces stress checks against unnatural and might risk awakening the tiger.
Notes:
This could also work for other games/settings, with adjustments to the label as needed.