The two disciples were Peter and John ( Luke 22:8). Normally women carried water, so a man carrying a water jar would not be hard to find. Perhaps the man carrying a water jar was a prearranged signal. Obviously Jesus had made arrangements to provide for His disciples" needs, but the Twelve had certain responsibilities in addition, namely, the preparation of the food. [source][source][source]
"He Who was born in a "hostelry"-Katalyma-was content to ask for His last Meal in a Katalyma." [1][source]
The whole record shows Jesus" sovereign control over the destinies of Himself and His disciples. Even as He approached the Cross Jesus was aware of and caring for His disciples. Nevertheless they had responsibilities as well. All of this is instructive for the teachable disciple who reads this account. [source][source][source]