Recently consolidated almost everything I own and took inventory of what I have.
By myself on minimum rations I have around 75 days worth of food. 30 of those days are in a box for my hikes/ski trips and are as good as I can get in terms of weight/calories/nutrients. Freeze dried meals gotten for free or bargin bin prices, long shelf life chocolate, dried fruit, jerky, nuts, peanut butter etc. The other 45 days are less glamorous; boxes of pasta, a 5kg sack of rice, canned crushed tomatoes, beans, bottles of olive and rapeseed oil, flour, oats. Was the last person at my school this past summer and there was a LOT of food left behind once everyone moved out, grabbed as much as I could but didn’t have the space for more than 1/4 of what was there. Keep everything in big plastic bins on a shelf in my storage.
In the station I work at there is a free hiker box for food/stove gas/consumables where people leave left over supplies from hikes or if they send a box with stuff and they can’t carry it all. When it starts getting full we have to empty it out partly or it becomes a real mess when people go through it to take a look. Collected quite a few iso-butane gas containers, 8 full and 10 1/2 to 3/4 full. Got a nice mixed variety of foods too; freeze dried meals from different countries, drink mix powders, rice, oats, chocolate, instant porridge etc.
The supply room of the station has a huge amount of consumables, if just the staff (4 employees in the winter 6 in the summer) was to live on what was in there after the big delivery at the start of the season, we could last somewhere around 5 months assuming there were no guests when SHTF and no one showed up afterwards (doubtful). Supplement with good fishing in the nearby lake, a huge wealth of berries in the summer, hares, reindeer and moose in the area; I’d prefer my job site to any other places where I’m welcome if SHTF.