Marahau has a few dining options locally, including two cafes and a great burger joint.
While there is no supermarket or dairy, there is a general store in Kaiteriteri beach (approx. 20mins drive away) but it is more of a Foursquare than anything comprehensive. There are some dining options in Kaiteriteri also, but from experience, we do not recommend it.
We recommend doing larger shops in Motueka (for camping food and drink etc) which is on the way to Marahau from Nelson. (Approx. 40 minutes from Marahau).
If you are coming on the ferry, be aware the food on board leaves a lot to be desired, but there is light at the end of the Cook Strait - Shai Shai's fish 'n' chips in Picton have to be the best we've had.
We will have a coffee cart at the venue, because we are not total savages.