no need to stack up on food in your luggage, all you need to do is when you get off the airport before going to hilton, rent a car, about $35 a day, drive downtown kona, there's a walmart, costco, target places where you can buy snacks, foods, water, toiletry stuff also there's mcdonald, jack in the box, burger king or what you can do also, drive the rent a car to the hotel, drop off your luggage, find other people that you know that wants to go to town, that way you can split the cost of the car rental or rent the car for 2 days so you can drive to the northside of the island, which you can visit the rainforest and the volcano.......
DO NOT RENT A CAR AT THE HOTEL, THEY CHARGE BETWEEN $75 TO $100 PER DAY...............................