Load your vehicles up with food and water. Bring plenty for you and others. Fill your packs with it and break bread with others.
FOOD is the secret to great turnout at any event. Food means you can party for a LONG time! Eating food together UNITES people as a family!
Proteins and fats are critical, and carbs will help those not used to walking all day keep going.
Clean water is super important too.
Armies march on their stomach!
Peanut butter, granola, and canned beans. Buy water by the gallon, that's the cheapest. If you're going to camp out in your car make sure you get a decent sleeping bag and some hothands hand/body warmers, one or two will last you the night just make sure you don't have skin contact with it or it will burn you, put it below your feet in the sleeping bag. Park off the beaten path otherwise police might give you trouble.
Pasta is cheap, stock up on it. SPAM is honestly really good sliced thin fried up and makes for a good breakfast food.
portable stovetop: https://www.amazon.com/gp/product/B01N1RO9WG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
portable propane: https://www.amazon.com/Coleman-Propane-Fuel-Camping-Cylinde/dp/B07S2KQ8PL/ref=sr_1_2?dchild=1&keywords=16oz+propane&qid=1608419650&s=sporting-goods&sr=1-2