For a small settlement, they are surprisingly comprehensive.
Groceries:
The Kaiwaka Four Square provides an excellent and wide-ranging service. They also have free local newsletters and papers that contain a lot of information about local services.
Kaiwaka Cheese Shop (Dutch cheese shop with many other deli choices)
Kaiwaka Food Mart (dairy and postal agency)
Caltex (limited food supplies but open slightly longer hours)
Cafés and Takeaways
Café Eutopia
La Nonna Italian Bakery
The Three Furlongs. Pub style menu and an extensive Thai menu (also available for takeaway)
Spice Lounge (Indian restaurant and takeaway)

Local Library
Kaiwaka has a great little public library https://www.facebook.com/KaiwakaLibrary

Happy to get suggestions for this page so please email me your thoughts