Oh chill out! Water is often MEANT to be drunk from a bottle (presuming it is a small water bottle and not a Litre size). To break up a shidduch over a girl drinking water from her bottle is just plain foolish. For other reasons, which you only alluded to, fine, but “the last straw” was her drinking out of the bottle????
BPT is right. If you are at dinner in a fancy restaurant, it would look wrong. But there are fast food places that served bottled water and Snapple/soda, and it is perfectly acceptable to drink from the bottle. At a picnic or strolling on a casual date at the zoo or Aquarium, it is absolutely proper. We are so hung up on naarishkeiten, that we cannot see the forest for the trees.