>>2245373Absolute minimum:
>shelterCan be a milsurp poncho and some cordage. Don't fall for cheap civilian tents, they're usually bulky, heavy, and a pain to set up. If you're strapped for cash and need a full tent for some reason, look for european milsurp (afaik, the US doesn't have one-man tents).
>insulationSleeping mat and bag. For the mat, if you're tough, nothing beats the German milsurp. That thing packs almost as small as a civilian ultralightmodel, it' just far less comfortable. If you don't mind strapping things to the outside of your pack, you can also get a cheap foam pad.
Bag depends massively on your climate and how much clothing you wear at night. I'm in the wool blanket faction, so can't help you there.
>packGet a large alice. Right now, they're dirt cheap (~40€) since the usmc canceled a major order for afghanistan. Not a perfect pack, but the best you can get for under 500€. Especially if you're going to be using cheaper gear, you'll need a pack that can load a lot of volume (and compress it, so it doesn't swing around) and that won't fold in on you under weight. Also, exoframes mean you sweat way less.
Everything else is either stuff you should already have (clothes, dishes, cutlery) or depends on what exactly you want to do (wood, alc or gas stove, bushcraft tools or not, folding chairs and tables or just sitting on your sleeping mat).
How much you need to spend depends on local pricing (duh). Here in Germany, a very basic kit can be built for <100€. My own is ~500€, but I have a bunch of stuff you probably don't need, since I made a bunch of mistakes in the beginning, and have multitools and knives for several countries' laws.
In general, milsurp is your friend when you want to keep things cheap. A bit more heavy, but good quality, cheap and made to be used - unlike memegear that is light and looks nice, but uncomfortable and breaks quickly.