Can anybody help? My kidney function was improving I moved from 39GFR to 66GFR then my lung specialist had to restrict my water intake to 1 ltr, because of lung and heart issues and the GFR last week dropped to 46! I was on 2 ltrs per day before. Diet the same just the change in fluids which have brought a vast reduction in feet swells and clearer lungs. Asked the Kidney specialist he just said to follow the advice given. But surely there is an alternative?