Yes, but be aware, the receptionist asks to look in any bag you bring, obviously to check for alcohol
They never looked in my bags, 'tho I have never carried a backbag with me, only so called manpurse (which can fit easily whatever I want to take in). And if you want to be on a safe side, just take few small bottles with you and put them in your pockets and you'll be ok.
It's not like airport or anything and I haven't seen any security checks done there for anyone. Unless they haven't changed their security policy, which I might not know about 'cos it's been a while already since my last visit.
Or just leave the place and have a drink somewhere else and come back after that, that's allowed. It's insane to pay 10 eur for one small beer in already expensive place.