I don't know if I would call drinking while on X "safe", but some of my friends do it and seem..err..fine. It's generally not a good idea because X dehydrates the shit out of you. It would prolly be a better idea to just pop a roll and sip on some water while you keep a close watch on that huge party in your own house. From my experiences, parties at my own house always get out of control once I get too drunk to care.