I'm currently drinking around 4 liters of Coca Cola every day, have been for about 5 years or so. Yikes!
I don't know about liver, but with that sort of Cola intake you will certainly get kidney stones. I have 3 friends who had kidney stones in recent years, all 3 were told it was because of carmelised sodas.
About beer, I used to drink anything put in front of me;-) But seriously Grolsch was probably my favorite. I used to like many imports over domestics like Heneiken, St Pauly Girl and too many others to count. For domestics I actaully didn't much like the standard big names like Miller and Bud, prefering some cheapos like Meister Brau and tons of the micro brews.
BTW sorry to hear about your liver, I'd say time to follow me into sobriety. It's not as bad as you may think, I don't miss alcohol at all. It may be hard at first, it'll get easy with time. When you are ~18 your body burns off everything thrown at it, once you hit your 30s+ it's a different story.
Good luck! If you need any support, let me know.
