S.L.
This is a problem I had for years (over 25 years!), which I treated with prescription diuretics (water pills). Do NOT go there if you can avoid it! You are going to have to break down and drink water. It's the best way to flush your system of the water it's retaining.
When your body is not getting enough water, it will hold on to the meager supply it has. Also, the body cannot distinguish the difference between hunger and thirst, so thirst can actually be interpreted as hunger, causing us to eat more than we should, or than we need.
Water is an absolutely critical part of the diet. The body is 70% water, and we are constantly losing that precious fluid through perspiration and elimination.
When you are well hydrated, everything in your body functions better, and even energy and state of mind are effected. And it does wonders for the skin! It is the greatest moisturizer there is, and for people with acne, it is the greatest pore de-clogger around.
The consequences I suffered from not drinking enough water and taking diuretics were plentiful. The worst one, and the one that had me rushed to the emergency room in the middle of the night, was a 9.5 mm kidney stone (almost twice the size that can be passed naturally) that had to be blasted surgically. I was sent home with a stent in my urethra, and after it was removed two weeks later, it took me another two weeks to pass all the fragments. I peed what looked like kitty litter during that time, and it was painful.
That was how I learned that the main causes of kidney stones are: dehydration, diuretics, excess caffeine, and nuts. I still enjoy my coffee, but no more than three (actual) cups a day. Remember that a "cup of coffee" is only 6 oz. A big mug is a double serving.
Buy an inexpensive water filtering system, like a Britta or Pur pitcher to keep in the fridge, and use it! Add fresh lemon to the water if it helps. It's good for you, too. You can also make a pitcher of "tea" by using the juice of one lemon and honey to taste per cup of hot water. Then let it cool in the fridge. This is a delicious and very healthy lemonade that's packed with anti bacterial agents (both the lemon and honey), and very good for hydration. You can also drink it hot
Believe me, you do not want to go through what I did with that enormous kidney stone. People have died from septic shock when kidney stones get stuck in the ureter, and that had been happening to me on and off for five years before I was properly diagnosed. Not to mention the blood in my urine sometimes for days at a time. My doctor misdiagnosed me, but that's another story. By the time I went to the hospital, I was doubled over in pain for six hours, vomiting, and running a fever. I was well on my way to a very serious health crisis.