And I'm sure the store shelves will be overflowing with valuable freebies because you are surely the only one counting on doing this, and you will surely be the first one there
Super Target isn't 24 hours over here, so I have a 50/50 chance that it'll be closed, which will afford me a little time. It's also less than 5 minutes away. Lowe's also has tons of bottled water, plenty of tarps to catch rain in, and every fridge has a filter, not to mention all the Brita type things they sell.
I also don't plan to support 15 people, I only have to support 3, including myself, the rest will be lagniappe, who seem formidable enough while approaching the fortress. All others will be volunteered to help build a range card.
I also don't really plan to see a "zombie apocalypse," and if it does happen, I don't think anyone's plan will work out like they planned.