Chabad serves gourmet, home-made meals for Shabbos (Friday night and Kiddush lunch). The Chabad school and offices are located at the Ala Moana Hotel 410 Atkinson Dr. in Waikiki, Kona Tower, Suite 2E1. Office hours: 9:00- 5:00 Mon-Fri,(808) 735-8161. To order Kosher meals call (808) 735-8161. 

To order Challahs call (808) 736-8161.

Deli sandwiches, burgers, fries and falafel, meats poultry and other Kosher foods are all available for purchase at Oahu Kosher and is all Glatt under the supervision of Rabbi Krasnjansky.  (808) 888-4949

Costco​ (Kahului, Kihei, Wailuku)  Sabra Chumus, Lox, Rye Bread and more Kosher products

Mana Foods​ (Health Food Store in Paia)  Huge variety of Kosher Pareve products. 

Safeway (Kahului, Kihei, Wailuku)  has small Kosher section​   

The Hyatt Regency in Maui offers Prepackaged Kosher food at their luau.  Also, the Chabad Shluchim in Kona have a take-out menu option, including Shabbos and weekday meals.

Whole Foods carries regular kosher products at most of their locations (Kahala Mall or Ward village)

For food on the Big Island call Chabad at (808) 499-4573 or check their website at

http://www.kosherinhawaii.com/

There is one Kosher caterer who does takeout/deliveries on Oahu.  His number is (808) 888-4949.  He will also prepare Kosher food for neighboring islands.