Hihi, that depends... if the whisky makes Daniel more talkative or less... As for his own glass...definitely. It wasn't even all that hard to slip the whisky past General Hammond and through the gate. Or perhaps the General just turned a blind eye - he knew how Daniel got when he was excited about languages, especially unwritten and unspoken ones.
Regardless, the only difficulty was keeping track of its location. All the more reason to make sure it was well and truly invisible...and you know... gone.
He just knew one of their hosts agreed with him when he realized the host in question was sipping an invisible dry white wine himself.