Emergency preparedness is something I think about (and practice) as well. I keep a supply of food, water, and gasoline on hand, as well as a battery powered radio, lanterns, candles, and firewood. I rotate through my canned food stock every few years; I end up tossing most of it as it reaches years and years past the "best by" date, and I keep some dry food, and have pretty well stocked freezer(s), and a small generator.
I live by a water source, but would have to boil/filter. I keep 10 gallons in two jugs.
Remember, if you have a standard hot water tank in your home there's approx 50 gallons in there waiting to be used if your water is shut off.
I can see why, living in an RV, you would be interested in something more portable.
One thing, I don't love storing in round buckets with lids for a small space, you can fit more in square or rectangular bins for the same footprint as a bucket, so look for non round containers.
And also when I read anything is "for patriots" my bs meter goes off. The whole "patriot" thing seems like it's attracting lots of scammers looking for easy marks based on fear. That being said, it's definitely worth thinking about and planning to be prepared.
They might be fine, but I bet you could get your own bins and fill it with what you want for less $$.
Costco has lots of good choices, from cases of ramen, Tasty Bites (Indian food, you place the whole packet in boiling water for a few minutes), big bags of nuts, beef jerky, canned fruits, soups, and chili. I guess with that diet you better throw in a case of TP, also. And don't forget a case of spam!
Throw in a can opener and a fancy water filter and you should be good for awhile.
You mentioned wild fires, and one thing I noticed watching video of the mass exodus from the Camp fire in CA was that the roads leading away from the fire were completely jammed. Many cars caught on fire in the traffic jams and the people had to escape to another vehicle, best case scenario.