I have been experiencing the same problem so I can really relate. Actually, having too much water is NOT good for your kidneys because they have to work harder to process everything we eat and drink, so it's actually advisible to drink less water and to have warm liquids such as teas or just hot water. This is also good for your bladder. Basically, do anything to keep these vital organs "warm". So a good hot footbath daily also helps me when I feel like my bladder is having problems.

I do take magnesium, I actually think that it supports kidney function, but I may be wrong.

Other than that I am also doing acupuncture and ionic footbaths to detox and up the function of my kidneys. There are some days where I still "feel" my kidneys and some pressure in them, but this is SLOWLY getting better. It will take some time, but try my advice with herbal teas and warm to hot water.

All the best,
Nina