I have an Owners Lockers which permits me to have a Brita water filter pitcher for all trips. I usually ship a box down ahead of time to the resort that contains some snack foods, cereal, boxed milk, small bottles of cranberry juice and a couple of bottles of water. We usually eat breakfast in the villa, saves time and money. The water bottles we refill and freeze, so we don't have to purchase water in the parks (that is a real issue for me). Funny, I can spend thousands on my
DVC ownerships, but it really ticks me off to pay $2.50 for a bottle of water.

Shipping the box may cost a few dollars, but it is cheaper than the airlines baggage fees they are charging right now. It is also cheaper to urchase those things at home than when I get down there, and it saves me time--no shopping during vacation.
Having the Owners Locker means I don't have to pack as much (most of my toiletries are already down there) and can avoid those baggage fees.