Each year, many states encourage citizen preparedness by declaring a sales tax holiday for many essential items. Here is one example: VA Hurricane Preparedness Week – sales taxes on some essential items are waived. See details on the State Emergency Agency’s website.
If you are not a Virginian, check with your local office of emergency management to see if your state has a version of this effort. A Google search turned up a similar program in LA.
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FEMA offers extensive guidance re hurricanes on this website.