It's the first law of traveling with kids: The minute you leave that emergency kit or other supplies at home, you doom yourself to requiring them.
Avoid making a middle of the night trip to the convenience store by packing a few standard items, like a first aid kit, age-appropriate thermometers, medicine (pain and cough relievers, in particular), bug spray and kid-friendly food and snacks. Whatever you do, double-check before leaving your home that all bedtime necessities have been brought along for the ride. Even the best-behaved toddler is likely to throw a fit upon realizing that her treasured blankie, pillow or stuffed animal isn't there to cuddle with. Guess who'll reap the wrath of such a situation? That's right -- you.