So you would like to build your own robotic bartender? The SirMixABot has you covered. It is an automated bar that turns your liquor cabinet into a cocktail pouring machine. You can assemble the kit easily and use the software interface to update what you have.
The system lets you know which drinks you can make with what you have. SirMixABot is offering pre-made drink robots too. You can add Arduino & Pi enhancements to do more with the machine.