what's the longest you've forgotten to buy a necessity, and what "silly ways" did you cope?

mine was over a week for body wash. when it almost ran out, i told myself, "don't worry, there's enough for two more days." then those two days passed, and i couldn't pump any more out. so what did i do? well, classic move - put water in the bottle and shook it, thinking it would last one more day. then it was completely empty, and i was literally standing there naked in the shower. (staring at the face cleanser) well, if it's good enough for my face, it's good enough for my body, right? thankfully, i remembered to buy body wash before the face wash ran out, too. i should have bought the biggest size, but i forgot and bought the regular one.