- Stills (rotgut, beer brewing device, nukacola machine) have working time (2 minutes). Process is started by using science, after all ingredients are ready (inserted like in normal containers). It's possible to insert multiple amounts of required ingredients, the output will be adjusted accordingly, up to 10.
Click on the Nuka Cola Machine and a "container" will open. Throw some fruits and SECs in there (don't know the rate, but try 20 Fruits and 10 SECs for example), then close the container and use Science on the machine.
Edit: ...then obviously, wait some minutes and then open the container again. The Nukas should be there now. Ta da!