Originally Posted by
Djokison
Since you’ve got 6 hours, you could just take the Metrorail to downtown. Walk around there, make an afternoon morning out out of it, buy your lemonade and then head back to MIA.
Metrorail tickets can be bought with a CC.
This is likely the best way to do this. There is a Whole Foods supermarket a few blocks from the Government Center Metrorail stop that should have what you need.