First of all I realised that I am on the "transformation route" the whole time hehe.
This is the fastest I can recreate this bug from starting a new game on the transformation route. Standard character, standard name and default looks.
- Go to the city center via the central park.
- Go to the train station, the ticket office and buy a ticket to Pavlovsk.
- Exit the train station and walk to the commercial area.
- Wait for 30 minutes since your hunger and thirst are still at 100.
- Now that they arent any more visit the public park.
- Here visit the newly opened "Del Parco" and order something from the menu (0:05)
- Drink free water!
- Leave and go back to the train station, back to the city center and back home.
- Enter the kitchen and cook a meal. Choose the hearty meal (3rd option).
- When you are done eat it.
- Voilà, -100 rub !
I hope that helps in squashing this bug!