Alright so I'm gonna go off of what happened to me last year for Matthew, and I'm gonna let my Boy Scout / McGuyver brain ramble here, some of this I've said before but that was 100+ pages ago
Let's say theres no water at the resort for you to buy what do you do?
1. Do you have a rental car? If so, head to your nearest walmart/target they might have it, they might not, BUT head over to the plastics department, pickup some plastic cups or bowls, you now have some vessels for water. Don't want to spend too much, head over to the Plastic Freezer bag department, get some gallon baggies and fill those up, store them in the sinks at the resort.
2. No rental car? Get some dish soap from the resort store (a DVC store would prolly have it right now). Wash out your ice bucket and fill that with water, ask house keeping for some extra coffee cups or glasses and fill those with water.
3. Before using your ice bucket for water storage, go use it to fill up your sinks with ice, this rings true at value and moderates as your ice maker is gonna be located outside and once in your room you won't want to leave to go to it. Store cups of water or bags of water on top of the ice so you got cold water. Also use the mini fridge to hold your water cups.
4. Grab some sandwiches from Earl of Sandwich for the next day, ask them to keep the mayo or sauces off the bread so not to make it soggy, ask for them on the side. Ask for a couple extra sandwich wrappers, use that clean wrapper to protect your food from the iron in your room so you can heat your food up. The wrapper should be a foil wrapper, if its paper or wax paper DON'T use it, you'll have to go cold turkey (pun intended)
5. I suppose you could fill your tub with water, I didn't feel the need to last year, it was only a day we were in our rooms by the afternoon we were wandering to the food court and it's Disney, as soon as the roads to their warehouses were clear they were delivering fresh product to the stores.
6. Grab some extra towels, last year they had them everywhere free for the taking (wonder how many they "lost" as souvenirs ) use them by the door, especially if your hotel room faces the direction the wind is blowing. That little crack under the door is gonna get wet, and it helps keep a bit of the sound down.
7. If you have a car, if you don't feel comfortable parking it in the hotel parking lot, take it to Disney Springs and park it in a garage, then take the bus back to your resort. Do keep in mind you will be at the mercy of the Disney Transportation to get back to Disney Springs. However last year it wasn't bad. But when they reopened disney springs for food joints at 5:30ish some places already had a 2 hour wait, so having the car at the resort and being able to go off property to find food before the masses get released might be worth it to leave it at the resort.
If I can think of more McGuyvery tips I'll post them later.