What flavor of apocalypse matters a lot. If it's zombies, ammo becomes critical. If it's nuclear, ammo is less important and water filtration probably becomes critical. If it's a gigantic asteroid that blots out the sun, water is easy to find but food is critical.

For an unknown apocalypse, I think I'll go with gasoline. Not critical in and of itself, but helps a lot more generally with a lot of stuff, being able to power a generator and move camp more easily.

Milk, given an unlimited supply i won't have to worry about it spoiling. Gives a decent amount of nutrients and water and can use it to make cheese or butter eventually, And is a life without cheese and butter really worth living?

Water; for living

Hugs from a nice person. The apocalypse is going to be really depressing I'll need the love

Fresh, hot pizza from Ray's.

Not fresh at the time of the apocalypse. Fresh at the time I seek it.

Of course that would mean I would also get a steady supply of clean water and of all the ingredients required to make the pizza. But that is simply a secondary side effect of having made my choice for the one, single thing.

Toilet paper. During apocalyptic scenarios, it's worth is apparently uncountable, so I will be able to trade it and live a life of opulence.

Along those lines antibiotics would be better.

All you big brains saying water.

My first thought was soybeans, since they're so versatile. Or corn for the same reason. Granted, I don't have any way to process them so I didn't think it through.

But a food source that also provides water would be a good idea. Watermelon is too sweet to be your primary food though.

I'm diabetic. I choose insulin.

Bottle caps.

drinkable water

Antibiotics.

We all would die so quickly and horribly without them.

Iodized salt. I live in iowa, we have planty of water (i can figure out how to filter it), and a great climate for growing food. However our soilis naturaly low iodine and there is no salt around so those are critical nutriants I don't think I could get here.

second would be iron - we don't have any and It is usefur for a lot.

Army MREs, the modern ones.

Assuming I'm not teleported elsewhere, the place I live has plenty of drinkable fresh water and other supplies, so the only real concern is having consistent high-quality food available, and MREs are engineered to support people in the wild for several months, if not years. In case of a major war breaking out, so it would contain everything I would need to stay alive, or to trade to other people.

Easy answers first. Potable water! You need it every day, helps with sanitation, growing food, etc.

If you wanted more like discrete consumable objects, keflex.

Edit: Or salt!

Pregnant women. Because they're hot and their milk supply is easy to induce.

Goats. Food, friends and defense.

Electricity would be tempting. If you have access to water, you can boil it to make it safe. Run a refrigerator to store food. A convenient source of heat for cooking. Stay warm in the winter, stay cool in the summer. Lights for when it's dark. Use power tools to build things. Listen to music, watch movies, play those old Nintendo games.

Even after some time when your electronics break down and scavenging working ones gets tough, it's not difficult to build things like simple resistive heaters. Making crude incandescent light bulbs wouldn't be impossible either.

unlimited other earths to live in

nobody has said rice or potatoes or anything like that. you're all completely fucked

also cum

My meds. I don't think I'll be able to do shit without them.

Gin, I don't plan on surviving in an apocalypse

Beans. Not only about the most important food source, legumes are also natural nitrogen fixers for soil health.

Will "fully equipped cruize ship" count as one item? Then I can scavenge them for all parts required to build new civilization.

And if it is not, then question to OP, what is the limit for the composite items to stop being counted as one item?

Not a single mention of bullets? Seriously?

In an apocalypse, ammunition will be worth more than gold.