As he served all his buddies and corporate sponsors alcohol in his private apartment.
no idea what he did in his private apartment but the 'red wagon inn' where he hosted had a private entrance and alcohol was available to walt's private guests.
Club 33 in Disneyland has always sold alcohol. And of course your can get beer and wine in California Adventure.
california adventure didn't open until 2001. club 33 didn't open until 1967, 6 months AFTER walt disney's death. for the vast majority of adult of drinking age visitors to disneyland prior to 2001 the only means to have an 'adult beverage' was to hop on the monorail in tomorrow land and ride to the bar just outside it's then exit adjacent to the disneyland hotel bar.