Things you will need:
1) Approach the Alchemy Station and read the book on the right. Open the potions section and the first potion will be Rescue Schnapps. However, if your character does not know how to read, then all the words will be incomprehensible to him.
2) To add ingredients to the alchemy shelf, click "Prepare" next to the potion. Then exit the book.
3) Add wine from the shelf on the left to the cauldron.
4) Select the nettle from the right shelf and add it to the cauldron too.
5) Select Belladonna and place it in the mortar in front of you. Use the pestle nearby to grind the Belladonna and then add it to the dish in front of you. Do this twice.
6) Press Q to use bellows. Heat the boiler until it boils (it looks like a small amount of flame in water).
7) Turn the hourglass on the right shelf. Wait for the time to run out, then turn it over again.
8) Once the time is up, add the belladonna from the saucer to the cauldron.
9) Turn the clock again.
10) When the time runs out, take the vial on the left side and click on the cauldron to pour out the schnapps mixture.