thanks for trying our game out , the chalk and holy powder spawns randomly in one of the rooms (majority hof the rooms have a safe place(Wardrobe) ) to protect yourself from in incase the worm/snake randomly comes in while you are still busy searching for items , and crafting (combining both of the items) in the kitchen area can get you a powder which can be used to mark out areas (the white lines you see on floor can be filled with the powder)