# Keep your eyes only on the field

"Watch the field" 

# Have I not instructed the men not to touch you?

This question can  be translated as a statement. Alternate translation: "I have given the men strict instructions not to touch you."

# not to touch you

Possible meanings are 1) the men were not to harm Ruth or 2) the men were not to stop her from gleaning in his field.

# the water that the young men have drawn

To draw water means to pull up water from a well or to take it out of a storage vessel.