Please consider meeting with the management of your local school to suggest a "no sugary drinks" policy
Below is a sample no sugary drinks policy for schools from the Ministries of Health and Education http://www.education.govt.nz/assets/Uploads/water-only-Template.docx

Sign your organisation up to be sugary drink free
The "No sugary drinks" logo and guidelines for its use are available here

Sign the petition to tax sugary drinks
https://www.change.org/p/parliament-petition-for-a-tax-on-sugar-sweetened-beverages

Sugary drinks scrapped from NZ hospitals!
http://www.3news.co.nz/nznews/sugary-drinks-in-hospitals-scrapped-2015093005#axzz3nG9BufIb

Sugary drinks scrapped from Auckland Council Leisure Centres
http://www.stuff.co.nz/national/health/82507640/Auckland-Council-drops-sugary-drinks-from-vending-machines-at-leisure-centres

Sugary drink free Polyfest
http://www.nzdoctor.co.nz/un-doctored/2014/october-2014/08/community-agencies-collaborate-with-commercial-sponsors-to-create-a-sugar-free-polyfest.aspx

Sugary drink free Te Matatini
http://www.tepanui.co.nz/tpr/2014/10/te-matatini-2015-2/

Sign the petition to get the government to act on sugary drinks
http://www.actionstation.org.nz/stop-marketing-at-our-children

That Sugar Film
This film is an invaluable resource to help spread the message about sugar in a fun and accessible way.
The trailer:

That sugar song (a clip from the film)

http://thatsugarfilm.com
If you are a teacher at a primary, intermediate or high school, there are educational resources available based around the film for purchase here:
http://thatsugarfilm.com/schools

Endorse the New Zealand Beverage Guidelines
Lobby your local School, Church, Sports club or other Community group to endorse these guidelines that provide a framework to limit sugary drink intake in the community.
http://www.fizz.org.nz/sites/fizz.org.nz/files/Policy%20Brief_NZBGP.pdf

Past FIZZ actions
FIZZ responds to criticism of a sugary drinks tax in Wellington's Dominion Post
http://www.stuff.co.nz/dominion-post/comment/10298685/Sugars-bitter-after-effects 

FIZZ presents the New Zealand Beverage Guidance Panel document to politicians in Wellington (19 June 2014)
Gerhard Sundborn introduces the guidelines.

Rob Beaglehole, Nelson dentist, responds.

Annette King, health spokesperson for the Labour party, responds.

Kevin Hague, health spokesperson for the Green party, responds.