Though you rarely hear of Ma or Pa Ingalls drinking anything but tea or coffee, the Little House series actually has a number of references to different drinks. . .Ginger Water when Laura and Pa were making hay before the Long Winter and lemonade at Nellie's party and 4th of July celebrations, for example.
Lemonade was a rare treat, though, as lemons were scarce and expensive. Fancy flavorings and drink mixes were a thing of the future. So what to do? Head to vinegar! Might be a bit of an acquired taste, but to the pioneers, it was a welcome change!