There's a youtuber I watch "CrazyRussianHacker". He reviews mainly survival things like MRE's, survival kits, generators, all things either SHTF related or camping related. And sometimes he does random knicknacks you can buy on ebay/etsy.
He lives in Florida and was affected by the hurricane. He posted on his FB due to using someone's hotspot that he's running low on food and water. English is his 2nd language, so maybe he meant the people are cause he should have lots of preps. But also, he has 2 husky's, wife, child , and a bird. So it's unknown until he clarifies.
But this brings me to this post. Are your preps still good if your home is under knee deep or any depth of water. MRE's, freeze dried food in mylar bags, canned goods, etc... would be fine. But any wood or charcoal stored will be unusable, so you won't be able to boil water. A portable propane stove or regular one will be usable, once you dry it off to boil water. And MRE's can be eaten without boiled water. I mean, you could eat the freeze dried stuff, just pour water in and let if soak for an hour or more. I know a few hunters who do that cause they don't want to lug a stove around. Ounces=pounds.
His water supply should be fine as it's water tight. Or he could mean that his roof blew off or his walls got knocked in so all his preps are not only underwater, but under debris, so he cannot access them.
We saw with Hurricane Katrina, peoples 1st floor under water and 2nd floor relatively OK. Can you survive on your roof, with the constant sun coming at you. Do you have a canopy you can put up that provides shade? Or will you just go to a red cross center if that happens and hope they have enough supplies. But we saw with Katrina that the Saints foodball stadium wasn't the safest as gangs were taking over certain parts. Are you CCWing or have a gun in your BOB and the nearest shelter is a school. Now federal gun free school zone applies. Will you be thinking about that when your home is all bus up? Now also add in HI's sensitive places law/ordinance.