As a follow on to this discussion, my wife has been diagnosed as dehydrated for over 20 years. She has a heart condition and on water tablets, plus water restrictions. Never affected her, she drinks what she wants and remains dehydrated. The medical profession stated she would be dead 30 years ago, she is still here, smoking, obese, 3 heart attacks, four immune diseases etc. taking massive amount of drugs. Close monitoring and the simple fact her body works with a low blood pressure, constantly dehydrated, limited mobility etc. Perhaps your body runs well dehydrated, we got some test strips for other issues but one of the tests is dehydration, always showed dehydrated.
My wife drinks litres of tomato juice at a time, perhaps try something you really like but if you remain dehydrated, should you really worry about it, it may be your body's norm!