1. Water.
2. More water.
3. Guns.
4. Ammo.
5. Allies.
You'll go through water faster than you realize, and the food on hand will last you a bit longer than you'd think. Beyond that, you need weapons, and you need friends with weapons. Anyone that doesn't have the above won't make it long enough to bemoan 6. Food, and 7. Medical supplies, and so on and so forth.
Water, weapons and allies. Guns you know how to use, and friends you trust that will rally up with things get rough. Family. Church. Co-workers. Whatever. A two week supply of water, plus ammo and a good squad means you get to go on to round 2 and round 3. All the badass survival gear you can buy won't help you if some thugs with sticks and knives rolls you up while you're asleep or jumps you when you're alone. A few armed men working together and defending land they know are more dangerous than a horde of looters.
there is a thousand year supply of water there, it falls from the sky.
Thank god it isn’t the desert, we will have more water than we know what to do with.