I’m on the road 3–4 nights a week. My little case has two bottles: the one in play and the untouched backup. I slap a piece of blue painter’s tape on the open one and scribble the date.
The sealed one stays in its box until the first is done. Last month I grabbed the wrong one during a 6 a.m. checkout and spent half the drive mentally retracing my own system.
Now they live in separate zip pockets: 'now' and 'later.' Not fancy, but it stops me from playing fridge roulette. For those who travel a lot, how do you keep the open one and the untouched one from becoming a guessing game?