I have about 6 hours in between flights at MIA and the flights are on different itineraries/airlines/alliances/terminals so I need to go landside anyways. Usually when I visit the USA I buy home a few packs of powdered zero-calories pink lemonade. Would it be possible to purchase some during my transfer somewhere? I don't want to use an expensive form of transportation (taxi, Uber, pre-order a van, etc) but I don't mind using public transportation as long they accept credit card since I will have no cash. Any advice?