Drink plenty of water? you might as well have just poured it on your ankles ! Water tablets and LESS fluid intake .
Drinking water in that situation is for 'normal' people ! not for renal patients.
You might ask your doctor about prescription compression stockings. They are knee high and do a good job of keeping your ankles normal. You will have to figure out how long you can do without them in a day before the problem comes back.
The technology has improved greatly, they don't look like old people socks. In fact they can look downright sexy! Do a search on Sigvaris Ever Sheer, you will be surprised.