To get the draught, you need to have already gotten the key from the bat. After that you go to the basement and fix the pipes that connect to the boiler. After that there should be some steam that comes from the boiler quickly use it to go in the air and get the draught (potion).
To get the lantern, you need to go to the bedroom and synchronise the clocks so that they both strike midnight at the same time. Then it pops out from the inner part of the fireplace. Then you just walk over it then it should add it to your visible inventory on your screen
The lantern is one of the four treasures (along with the "draught of the dead", some ice, and a chalice). Get all 4, and fill the lantern with kerosene in the basement. Then the ghost cat will tell you where to take the items.
You still need the other 3 treasures: - the draught from the basement - the chalice from the attic - the lantern from the clocks in the bedroom
Nothing right away. Recover the other 3 "treasures" (ice, draught, and lantern) and refill the lantern with kerosene in the basement. Then the ghost cat will direct you to the cemetery statue.
When you have all 4 of the treasures -draught - ice - lantern -chalice and have filled the lantern with kerosene from the barrel in the basement, see the ghost cat (right of kitchen) who will send you to a location in the graveyard.
Fill the lantern with fuel from the barrel of kerosene in the basement. Once you have the lantern, the chalice (in the attic), the ice (in the kitchen) and the draught (in the basement), see the ghost cat to the right of the kitchen. You will take the 4 treasures out to the graveyard, to the statue of the crying girl.
You need the Chalice and three other items to complete the quest. The other treasures are the Lantern, the Draught, and the Ice. To get the Draught, rearrange the pipes in the basement to create a steam geyser at the top of the boiler. The Draught is on the shelf. To get the Ice, get the pick axe from the knight in the hallway and chip ice cubes from the freezer. To get the Lantern, synchronize the mantle clocks in the third floor bedroom. (see related question)
There are Four Treasures you have to find in the Haunted House (and other items such as the key, the axe, and the flying broom). The four are the Draught, Ice, Lantern, and Chalice. The Draught is on a basement shelf. The Ice is in the refrigerator in the Kitchen. The Lantern is hidden in the fireplace in the Bedroom. The Chalice is locked in the chest in the attic. (for solution, see the related questions)
The 4 treasures are the Draught, the Ice, the Lantern and the Chalice (goblet).To get the Draught, rearrange the pipes in the basement to create a steam geyser at the top of the boiler. The Draught is on the shelf.To get the Ice, get the pick axe from the knight in the hallway and chip ice cubes from the freezer.To get the Lantern, synchronize the mantle clocks in the third floor bedroom.To get the Chalice, use the spider to scare the witch painting, then fly on her broomstick into the attic, and unlock the large chest.(see also the related question)
Once you have the 4 treasures (draught, chalice, ice, and lantern), go to the basement to fuel the lantern from the barrel of kerosene. Then talk to the ghost cat in the room right of the kitchen, who will tell you to go to where "the cherub cries" -- a reference to the statue of the weeping girl in the graveyard.
The ghost cat tells you to look for the four treasures (draught, ice, chalice, lantern). Once you have them, and have refueled the lantern at the kerosene barrel in the basement, the cat says to go to the "crying cherub", which is one of the tombs in the graveyard to the right of the house.
Once you have all of the treasures (draught, ice, chalice, lantern) you can fill the lantern with kerosene in the basement. See the ghost cat and it will tell you to go to the "crying cherub", which is the tombstone of Betsy Blue in the graveyard. Go down the hole to discover a group of monsters awaiting you.
The 4 treasures are the Draught, the Ice, the Lantern and the Chalice (goblet).(there are other items as well : the key and the axe)To get the Draught, rearrange the pipes in the basement to create a steam geyser at the top of the boiler. The Draught is on the shelf.To get the Ice, get the pick axe from the knight in the hallway and chip ice cubes from the freezer.To get the Lantern, synchronize the mantle clocks in the third floor bedroom.To get the Chalice, use the spider to scare the witch painting, then fly on her broomstick into the attic, and unlock the large chest.(see related questions)