You probably have a few water bottles stashed for an emergency, but if you rely on sensitive medical gear such as a CPAP machine, that isn't going to work. In a disaster scenario, finding a gallon of ...
±5 (at 1/3 EV, 1/2 EV steps) ±5 (at 1/3 EV, 1/2 EV steps) ±5 (at 1/3 EV, 1/2 EV steps) ±5 (at 1/3 EV, 1/2 EV steps) (2, 3 frames at 1/3 EV, 1/2 EV, 2/3 EV, 1 EV ...