New Jersey is rather fussy about any alcohol sales. If it's above zero proof - it's booze! Don't go looking for beer/wine at supermarkets and convenience stores; only genuine liquor stores (and there are a limited number of licenses) can sell any hooch whatsoever there.
As far as Hilton itself goes, my last stay at ES - Portland, OR included a Manager's reception with unlimited well drinks; prices were clearly displayed for Top Shelf.