What time do the bars open until in taksim square?
as i told you. taksim square changed a lot since 2010. nightlife is in Besiktas and esp Kadıkoy.
I was a taksim regular Taksim guy until, i dont know, i went to amsterdam in 2007 and when i came back in 2012 saw that that things have changed. The nightlife shifted to Besiktas and Kadıkoy as of today.
So, the answer to your question,
not many pubs as it was in 2005 (when pool fans came) in taksim. Nevizade street (GS fans street is good). I was there 3 weeks ago, to watch BJK-GS game. i left after the game, it was 22.00 i think.
Legally, the bars should be closed at 2.00 am. probably same for Taksim. i dont vist taksim due to the reasons i tried to expalain.
For Besiktas. 4 a.m. It is not legal but pubs are open until 4.00 am
For Kadıkoy. till the morning :))) yes thats true. but 4.00 am lets say. it is not legal, but thats how it is.
you can not buy alcohol from stores after 22.00 legally. there are stores who sells. you may find many in taxim, or besiktas or kadıkoy but i can not guaranteee...