my 2013 jetta 2.5 makes a squeaky water bottle sound in back side near drivers side

Well a bit more information would really help, I have no idea what a squeaky water bottle sound would actually sound like. But being a late model vehicle, you should probably have the dealer check it...the VW's are pretty solid vessels and an unusual/alarming sound should be sorted, lest it leads to more expensive problems.

Jettas, known for its plastic trim noises(check the forums) in the passenger.. cabin. IF you're referring to an outside suspension squeak test it by rocking, pressing on the rear of the vehicle, while someone else listens and searches for the source of the "water bottle" PLASTIC squeak. Regards