"Best" is relative. I'm going to assume you don't have your own transportation.
Quick? Uber/Lyft/Taxi
Cheap? Disney Transportation. Probably Bus to MK, then bus or boat (if it's running) to WL. Can bus to any park or DS and then bus to WL. I'd allow probably close to 90 minutes if you use this route.
Easiest with an ADR is grab Uber/Lyft. Least expensive route I think I'd catch a bus AA to DHS, then grab the WL. From there grab the first Park bus (Epcot or DHS) then bus back to AA.
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