Cola was a sweet, carbonated soft drink from the planet Earth first created in the late 19th century. Like coffee and tea, cola had a high caffeine content.
In 1996, Rain Robinson consumed a can of cola using a drinking straw. (VOY: "Future's End")
The drink dispenser in the mess hall of Enterprise NX-01 was programmed to serve cola, among other hot and cold drinks. (ENT: "Breaking the Ice", "Fortunate Son", "Regeneration", "Terra Prime")