Youngmaidensgoingouttodrawwater - So far is it from being true, that young women were always kept closely shut up at home, that we find them often in the field, drawing and carrying water, as here.
Matthew Henry
Concise Bible Commentary
The very maid-servants of the city could direct to the prophet. They had heard of the sacrifice, and could tell of the necessity for Samuel's presence. It is no small benefit to live in religious and holy places. And we should always be ready to help those who are seeking after God's prophets. Though God had, in displeasure, granted Israel's request for a king, yet he sends them a man to be captain over them, to save them out of the hand of the Philistines. He does it, listening graciously to their cry.
SDA Bible Commentary (limited)
Volume 1-7
11. Up the hill. Naturally the asses would not be in the towns. Saul and his servant would be looking for them in the fields, where the people had their gardens, or in the open countryside.