Just found out that I have high blood sugar. Dr. prescribed Janumet to get my bloodsugar down. I'm running a marathon on Sunday and one of the cautions for taking Janumet is to stay hydrated to avoid lactic acidosis. I'm only taking a single dose for the first couple of days but I'm concerned about staying as hydrated as I can on Sunday. Anyone have any experience with Janumet or Metformin hydrochloride one of the ingredients in Janumet. Thanks in advance.