Fly or not, we take a 6-pack of our favorite soda. We take one a day into the parks, and then just refill as necessary with water from a water fountain, or with whatever's left in our cups from a restaurant (much easier to toss a bottle around than a cup with a lid). Plus, my hubby drinks Mt. Dew and Dr. Pepper, neither of which can be found in the parks.

We also take way more memory cards than we could possibly use. We learned on our first trip together (post-digital camera-age) that WDW charges way, way, way more for a memory card than the typical store. But are you going to stop taking pictures? No way! We ponied up the $75ish and kept snapping away. Now, I take 5-6 cards with us.

And since having kids, we take snacks with us in the diaper bag. We can hang it on the stroller, and have snacks whenever needed. My DD eats like a bird (little bites all day long), so just because lunch was an hour ago, doesn't mean she's not hungry now.