Euthanasia exists since mankind, nowedays its more and more an issue, people encounter and have to think about it in their or others lives. There is even a book with a script made for the last 24-48 hours.
The Selfhelpkit is created for these last hours. It works as an addition to the ritual. By means of pouring water in the form, the first shell and then later a second shell will expand/break of in a certain time period and reveal the core. (traces left behind like an indicational of the decision).
The closed glass core that is revealed now contains the lethal drug.
Breaking the core at the end of the time period is the last decision and at the same time the last thing that happens.