When it comes to drinks my family is fairly basic - they drink water or soda but mostly water. When we have family get-togethers water and soda are more often what we serve so I often forget to think about beverages. When winter comes we do pots of spiced cider or wine, occasionally a special coffee but rarely anything more. (unless you could our endless consumption of tea which is like water).
On Halloween, I would often serve Bug Juice which is the only punch I ever make.
However, you don't need a recipe to dress up your Halloween drinks.
You can choose to go more traditional with hot drinks such as cider or hot chocolate. The adults might like a bit of spiced wine.
The real trick is to alter the perception of the drink. Give your drinks Halloween names - Cauldron punch, larve shake - whatever. Then dress them up. Use gummy bugs, body parts, worms, mice - the varieties are endless. Drip blood from the glasses - mix corn syrup with red food coloring and dip the opening of your glass. The syrup will slowly run down the glass (this does stain so be warned).
Add dry ice to give it a steamy effect.
Create spooky ice cubes - freeze green olives for eyes and creepy toys if you are not serving to small children. Freeze different colored Kool-aids in ice trays. You can use black cherry and orange to make Halloween colored cubes.
The ideas are really endless if you open up to them.