Here is an Amazon list of all the parts needed for a Hello Drinkbot, except wire and the laser-cut frame.
Here is an Amazon Idea List as well.
Here is a Google Sheet with the Bill of Materials broken out on a per-bot basis.
Notes on the Touch Screen
The BOM includes a 7" touch screen as an example. I have tried doing some prototype cases, but so far I don’t have a case which lets you cleanly mount the touchscreen. Also, if you go with the touch screen or an external monitor, you may also want a keyboard. I have this wireless keyboard — it includes a trackpad and has worked well so far.