Hi Karen,
There is soap and shampoo provided in all the Disney resort hotel rooms, so there's no need to make a special trip for that. Additionally, all the hotels have a gift shop that stocks
basic personal care supplies, these are a bit pricier than you'd find at a supermarket, but they're there if you need them. You can also find bottled water, soda, and basic snacks at all the resort gift shops. Again, this is more expensive than a supermarket, but it's there if you need it.
Some guests do mail themselves a package of supplies to be delivered to their hotel. Since you are not in the US, this might be cost prohibitive for you. Another alternative would be to order directly from the US version of Amazon.com and have supplies that you need delivered directly to your resort. They carry bottled water, food, and personal care supplies. If you do send a package, please note your arrival date and the word "guest" on the box.
If you have large needs, a good alternative is a grocery delivery service such as gardengrocer.com. Many of the moms on the panel have used this with great success. You do not need to be present when the order is delivered, the hotel will accept it and store it on your behalf. For smaller personal care delivery needs, you may want to consider using turnerdrug.com. Again, the hotel will accept a delivery on your behalf.
Good luck with your planning. Please let us know if you have additional questions.