Dan drank 3/7 of his water bottle before lunch and 3/7 of his water bottle after lunch. How much water is left?

Question

 Water bottle match question.

Answer 1

THREE PARTS OUT OF SEVEN ARE CONSUMED; THEN LUNCH; THEN THREE MORE PARTS OUT OF SEVEN ARE DRUNK.

 

MY GUESS IS THAT ONE PART OF THE ORIGINAL SEVEN PARTS REMAINS.  1/7