Thickened liquids are often recommended for individuals who have problems swallowing thin liquids. Juice, milk, water, and even coffee can be thickened. Pre-thickened beverages are available commercially, or they can be prepared with various commercial thickeners. This 4-page fact sheet describes various consistencies of thickness, how much water various puréed foods contribute. Written by Wendy J. Dahl, and published by the UF Department of Food Science and Human Nutrition, March 2013.
http://edis.ifas.ufl.edu/fs218