Stocking a bar doesn't have to break the bank. Start with the basics, and build from there. Assess your bar supplies each season and before each planned party. In the warmer months, think beer, white wine and light spirits.
Jack Nightmare Before Christmas Wine Bottle Painted Skellington decor decorations
44 Disney Cruise Hacks You Need to Know Before Sailing...some good ones listed here, but also a few inaccuracies listed also (ex: alcohol brought on board is now limited to wine and beer, not hard liquor. Amounts are also regulated.)