We have 25 - 55 gallon food grade containers that had dr pepper syrup in them for storing water. I bought them for $10 buck a piece from the company that bottles the stuff here. They have been cleaned inside & out with bleach water and allowed to air dry. You need to use a white hose purchased from an RV supply place and a syphon pump to get the water out.
You also need a 72-hour pack for each person & animal containing water & food a flashlight with batteries & clothing for warmth in your pantry and ready to go in case you need to get out quickly.
I worked off a Mormon list so I think we're square on the food. I didn't do the full year supply, if it gets that bad we'll be building a cabin in the forest. You're never as ready as you could be, but I'm always thinking about ways to upgrade our preparations.