@babbsjoy Well, I am on a laundry list of meds and know firsthand just how tiresome it can be. Staring at a handful of pills of different colors/sizes/reasons just isn't my cup of tea.

Crushed ice in a glass of water is actually refreshing to the palate. Maybe add a packet of True Lemon, which is actually crystallized lemon. They also make True Lime and True Orange, same thing. It gives a bit of a taste but not overwhelming.

Hydration is such a key factor in kidney health. As you said, too much is no good, not enough is no good. I really think it is a balancing act each day, depending on weather, activity level, diet. Is your dad on dialysis, as that may play a part also. Most good nephrologists will tell you to drink before you are thirsty. If you wait until your body says, "drink", you've waited too long!
Ginger