i could not find a good source of information on the damage done to liver during a oral cycle, the reason i ask is because i am wondering how much drinking can be done while on and during pct.

I hated every minute of training, but I said, "Don't quit. Suffer now and live the rest of your life as a champion." -Muhammad Ali
I'm pretty sure drinking alcohol in general is ****ty for physique purposes. maybe some red wine is good, but I don't know anyone who goes to the club and sips one glass of wine.
nonetheless, pretty much everyone will tell you to limit alcohol on cycle but people still drink and they don't die. will it tax your liver a little more? probably. but if you're otherwise healthy and not on some extreme dose of toxic hormones then you're probably not going to run into serious health problems.
pct aka nolvadex in this case since you used a methyl, is hard on your liver too. And you should be using nolvadex if you used a methyl. So I'd avoid drinking on PCT as well if I were you
I used to be the type to go out twice a week and drink a good amount (college student) but when I was about to start a cycle I stopped drinking for a while and didn't realize how much quicker my progress could have been if I didn't go out all the time. Now I barely drink and my "crappy" gym sessions almost never happen. Glad I learned my lesson.