@babbsjoy, I added your question to the Chronic Kidney Disease support group as well to get their tips.

This must be so hard. Like they say, you can bring a horse to water, but you can't make them drink. I can see that you have been very creative in trying to encourage your dad to drink. Despite that effort, he's not meeting you halfway. He gets annoyed. You're drained and at your wit's end. What a carousel!

It bears repeating. This is hard.

Am I correct in assuming he understands the importance of hydration from both you and from his nephrologist? Is he also declining to take some of his meds?