I tested this with both fresh juice (unpasteurized) and a bottled organic pasteurized juice and they both tasted great. Brands such as Eden Foods or Lakewood are great options.
Place all ingredients in a small saucepan. Heat over low, stirring occasionally until honey and salt is dissolved. Pour into a glass container and store in the refrigerator. If you use a fresh juice (unpasteurized) it will keep for about 4 days in the fridge. If you use a pasteurized juice it will keep for about 2 weeks in the fridge.
To serve: Stir 1-2 teaspoons concentrate into 8 ounces water (if you prefer a stronger flavor add an additional teaspoon or two) or mix all of the concentrate with two quarts of water.