Hello Andrew!
Purchasing a Disney Souvenir rapid refill mug at my Walt Disney World Resort for use on my Walt Disney World vacation is one of my favorite things! Typically, once you purchase this rapid refill mug at your Walt Disney World Resort and have it activated at the time of purchase, it is usually good for refills for two weeks (14 days), according to my experience. Also, you can refill them at any Walt Disney World Resort as long as you are within the time period of use after activation. Remember that these mugs are not refillable in theme parks or water parks but only at the Walt Disney World Resorts.
So for your split stay at two different Walt Disney World Resorts, you would only have to purchase the rapid refill mug at your first Resort (
Disney's Wilderness Lodge Resort). It should be good for refills at your second Resort (
Disney's Beach Club Resort) as long as it is still within the 14 days from the first purchase and activation.
I like to keep my refillable mugs as souvenirs of my Walt Disney World trips, and when I use them at home, they remind me of my Walt Disney World vacations and the great memories I made.
I hope that your next Walt Disney World vacation is truly incredible in every way!
Marc L