Easy walk, 5 - 7 minutes, out the back entrance and go left over the bridge.
The transpo back to AKL could be tricky, depending on when you finish eating. If you don't take the car, you will have to take WDW transpo or a taxi. If you take the car, and leave it in the EPCOT lot, you'll still have to walk all the way back through EPCOT to retrieve it. If you finish dinner later than park closing at EPCOT, that's a problem.
Easiest way back to AKL would be a taxi from the BW. Next easiest may be to move the car from the EPCOT lot to BW parking, before you eat, so it's right there when you're done. We split our party sometimes, and have done this, and one person moves the car while everyone else walks over, and we meet at the restaurant. Then, the car is nearby when we're finished eating.
Lastly, without a car, you could use WDW transpo, from either the MGM or EPCOT bus stops (which you have to get to). Or, catch a bus from BW to DTD or another open park, then transfer to AKL bus.