Thanks everyone for all your valuable suggestions/advices. We have finally managed to book accommodation/ 12 seater rental car (toyota hiace) with 3 booster seats for the kids.

We have booked serviced apartments @ Grafton, Auckland & a bach at Hamilton & Queenstown to cover our 13 day trip to NZ. To cut down costs we were hoping to cook at least 2 meals everyday. Can we bring in the following items in check in baggage/clear customs at NZ provided they are packed/sealed by manufacturer with explicit mention of its ingredients.

Curry Paste
Curry/Masala powders
Coconut milk packed in tetra packs.

Yes we will definitely declare these at customs checkpoint. But I want to check whether these are allowed in NZ as we dont want to bring them and then asked to be thrown out.