If I lived in Hawaii (particularly Kauai), I would definitely have 3 things in my survival kit: a good air-rifle with tons of ammo (the place is over-run with chickens), a good fish spear (the place is over-run with fish), and a couple good pig-hunting dogs (well, you get the idea). I know there are plenty of dry places in Hawaii, but the places I have regularly visited on Kauai get upwards of 300 inches of rain a year, so I wouldn't worry too much about fuel cans and water. YMMV.