What don’t you have already? Think of the rules of 3’s and shelter, water, food... Make sure the basics are covered.

Agree with containers for bulk water storage. Water is needed for drinking and it’s also good to have around for hygiene.

I’m not a fan of buying gear just because a storm is on its way. Buy stuff that’s useful with or without a storm. Water filtration is something that’s useful and in some coastal communities the tap water on a good day tasted brackish. I’ve been using water filters with “potable” water since 1985 when I lived near the coast in Virginia. The water was awful without a storm let alone with compromised system.

You should probably add a few gallons of bleach to your shopping list.
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Better is the Enemy of Good Enough.
Okay, what’s your point??