Advice - Healthy Workout Supplement for Kidney Challenges

Hey guys.... wondering if anyone has or had a similar problem/challenge and what you are doing about it? My husband is a great guy, but isn't always willing to talk about these things.

I recently was told my kidney function is on the verge of being classified as Kidney Disease pending additional tests. I am 40, in decent shape, on TRT, and working out. The doc thinks it could be a combo of things over a period of time, because most of my labs are pretty good. I was told no creatine, no caffeine, and to avoid booze. My biggest fear is how to manage without preworkout in trying to stay in shape. My work schedule is impossible for evening workouts and I rely on the pick me up in the morning for early morning workouts. Anyone else cut out caffeine and stay active? If so, how did you do it?

Thank you for your honest feedback.