Hi Leigh,
The liquid accessory is indeed not available yet, but will be in the near future.
As for self fabrication of a liquid accessory: SCiO needs to be in contact with the optical window so you should make sure there’s no direct illumination from the illumination source to the spectrometer. No focusing is needed. You will also need some kind of a reflector to make sure the light comes back to the sensor.
Ayelet