I believe the first C-17 landings at McMurdo are for winfly (which I guess counts as winter). Flights stop in ~November due to the deteriorating runway conditions.
At McMurdo it's... Ok. It's hard to cook well for so many people. At smaller satellite camps or places like the south pole the food is quite good. Obviously a bit low on fresh vegetables but the food is overall pretty high quality.
As for drinking, yes that can be a problem, particularly at McMurdo which can have a fratty atmosphere as well (see also, the recent NSF report on sexual harassment in polar programs)
There was a helicopter inside. Pretty nifty.