Emergency water doesn't freeze. Get the packets of the "Blue Cans" - its all distilled water, which is fine for emergency situations. The rigid gallons are not made to last longer than 6 or so months and will even randomly split and leak on a shelf. Get the long-term stuff.
I'm also seeing a lot of people that don't pay attention about food. Forget the cliff bars since they'll go bad in less than a year in the heat. Get the Coast Guard regulated food bricks. $7/8 for a 3600 kcal brick that'll last 5 years in your car without issues. After that 5 years, replace it and crack the old one open and taste-test it to remind you of how it tastes. I did this with my kids so they knew how it tasted, both basically said it was like a cookie.
If you just learned 2-3 things here, please do research on YouTube or such for car bags. It'll blow your mind in just a few minutes for just about any random video.
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