OK if you want cheap local filling food, Kapolei is where you will need to go. For breakfast I recommend Koa Pancake House and My Cafe. For lunch and dinner there are multiple options. Ramen I would recommend Ramen Bones. Sushi there is Sushi Bay and Genki Sushi. Burgers I would go with Teddys Bigger Burger, for curry there is Coco Curry House next door another restraunt next door has hot pots if that is your thing. If you like yakiniku there is Gyu Kaku by Target. Also if you like a little cheaper menu you can goto Eating House 1849 which is also owned by Roy Yamaguchi and it is right next to Gyu Kaku. There is also Denny's and Ruby Tuesdays in the same shopping center with Target. Great Italian place like someone mentioned at Assagio and if you like pho there is Pho and Company right next to the old consolidated theatres. If you are willing to drive to Ka Makana Alii mall there is a brand new less than 2 month old Cheesecake factory. Also in same shopping center there is a California Pizza Kitchen, Applebees, Johnny Rockets, Five Guys Burgers (get ready to pay double what it costs on the mainland US) and a bunch of other eateries. I have seen a shuttle around Koolina that goes to Ka Makana Alii mall during the day. However I have not taken it so might want to ask the hotel.
If you have any more questions post away or pm me and I will help you as best as possible.