I’m a newbie here and NO EXPERT.
However, I say knock yourself out with the lemon water; it’s hydrating and good for your system regardless. Milk Thistle is always good for the liver from my understanding and certainly won’t do any harm; perhaps some good. No comment on the liver flush as I don’t have any experience.
Best of luck. It’s good to see someone in-tune with their symptoms early on and taking protective steps.