Water is related to Essential. 
you are likely to find Candle in/at/on Restaurant. you are likely to find Candle in/at/on Shelf. you are likely to find Shelf in/at/on Bathroom. Bathroom is related to Bed. 
Water <--RelatedTo--> Essential 
Restaurant <--AtLocation-- Candle --AtLocation--> Shelf --AtLocation--> Bathroom <--RelatedTo--> Bed 