I got to the task where Kru put the potion, here's the message:
Remember. I'll put an option where you can get it.
Be sure to use it when you hear one of these supply
chambers. Once I get it, we can see how it works
better, and I won't have to worry about needing
treatment.
But I can't figure out where this potion is or what to do at all. I've already checked all the options. New parameters or areas are not displayed, and the dialogs are repeated, as on Groundhog Day. That's all for now, or I don't understand something? Maybe someone was able to move on?