Not technically a tool, and there could be an entirely separate post on the best pantry for traveling, but this one is essential. This is the kind of thing that always happens: You don't buy salt at the grocery store when you go to stock up on provisions for the vacation either because you don't realize you need salt, or because you don't want to buy a whole box when you'll only be in this house a couple of days. But salt is what makes things taste good. Cooking awesome food and then realizing you have nothing to season it with but a half-full, water-logged salt shaker is the worst. So pack some dang salt.