@no money Daisy answers most of those in her blog
You can buy most of the liners online looking for mylar bags
The dry ice just gets rid of oxygen that causes decay, you will want to get some oxygen absorbers to put in with food.
Rice buy only white rice as it last longest brown has oils on it which go rancid.
Wheat look at an organic baking supply shop but look at getting a countertop grain mill with stone wheels or it is alot of work to grind.
Salt and sugar last forever.
You can make your own mre style meals they just won’t be as compact and most will require cooking and water to eat, but they will taste much better. This can be found on daisy’s site as well
Mountain house has ok stuff but to try them go to local outdoor place and buy some freeze dried food and try, no sense buying stuff you cant stomach unless for trade.
If you have huge storage go to aliexpress (alibaba) and buy bulk by tonne they have all the things you want.
Dried beans and vegitables even some pickled items
Look at Craigslist or kijijji for food grade barrel. If the smell then fill with water and
Use either baking soda or vinegar to get rid of the smells
Daisy has a canning book it is full of useful info buy the jars at yard sales and thrift shop buy the lids from store. You van never have enough big mouth canning jars or lids.
Most things here is a mix of stuff and skills pick one thing Inside food prep and do it it takes time and mistakes to learn. Do it now when a mistake is a bunch of rotten food rather than going hungry for a winter. Join a group that does this and learn from the local pros…
I am only guy at canning bee here locally but I lift the heavy stuff and they teach me the tricks of the canning skill.