All parts are BPA-free and dishwasher safe (top shelf!). Of course, I thoroughly washed it before first use with water and soap!
It’s quite simple to prepare and took me less than two minutes.
All I got to do was filling up the small cup with 6 oz. and the large stainless steel cup with 16 oz. of water.
In both cases, this is about 90% of the cup size.
The smaller cup must be twisted on the lid. The water in the large cup must be poured into the black cup before being screwed on the lid as well.
At last, I put everything back together and placed it in the freezer for at least 12 hours.
This is what happens inside the Hyperchiller: