The best is to work with your current suppliers - they may have a branch or DME suppliers they have worked with in the area. They can help you with physician orders and making sure you can get what you need.
Depending on your exact supplies, you may be able to send them to yourself at your resort - we‘ve done that with my daughter’s urinary supplied. We also bring a suitcase of medical supplies when we travel by air. As long as the suitcase contains only medical supplies, it flies for free and doesn’t count against your baggage allowance.
Disney also recently expanded their partnership with AdventHealth to include things like planning and DME. AdventHealth Services at WDW