Well, to be honest, any kind of processed packaged food, unless you have a warehouse, is temporary short to mid range to a year. This gives you time to find more canned goods, but it gives you time to start planting sustainable sources. Also finding sustainable sources (ie an apple tree nearby).
As for water Big Berkey filters will last a long long time. Prefiltering out stuff before putting that water into a filter will make it last longer.
In the end there really isn’t any great options for survival long term unless real constitutional government like we had in the beginning of this country, are put in place again. It unfortunately may not work as well as back then almost everyone was Christian and could be counted on controlling (self-governing) themselves.
You can't eat all those apples before they're out of season so print out plans now on how to make a dehydrator using just sun and air.
Wow, there's a red squirrel in the yard. Hadn't ever seen that color here. Pretty thing. Yeah, they're first on the fresh meat list.