Called "Switchel" in the 18th century, Works really good!Combine 1/2 C. Apple Cider Vinegar to 1 qt of water. Stir in 2-4 T. raw honey, add ice and enjoy!
My Granny used to add 1/4 tsp. cinnamon, sometimes, and it was delightful. We always carried this concotion while we were on the tractor, cutting, raking, baling hay, because the hay fields were too far away from the house to just drop what we were doin' and come in for refreshment. This may be what you're thinkin' about unless it was a commercially prepared drink...