In substitution type of questions, some particular objects are assigned code names. Then a question is asked that is to be answered in the code language.
If sand is called air, air is called plateau, plateau is called well, well is called island and island is called sky, then from where will a woman draw water ?
A woman shall draw water from a 'well' but a 'well' is called 'island'.
So, the woman will draw water from an 'island'.