I think most people in this thread are vastly underestimating the challenges the OP poses. No tools. Think about that. But we can make alcohol to use as an antiseptic! Oh really? In what containers? How precisely are you going to store this alcohol? You have no handy bottles around, you know. Perhaps someone in the random 2000 people has some idea of how to build a kiln and fire pottery from scratch, but this is no trivial undertaking. To be worthwhile, we need some sort of glaze to seal these hypothetical ceramics. We need to build a kiln with no tools. We need to collect a shitload of firewood, again with no tools. Or perhaps some crude stone axes, if anyone can figure out how to knap flint (assuming a source of flint can be found).
And food. Man are you all being optimistic. Once the ammunition runs out, we’re pretty much fucked. Hunting mammoths with pointed sticks. Or, optimistically, with crude stone-tipped spears. Oh, sure, it can obviously be done, because it was done, but none of us have the skills required, and the learning curve is likely to involve a lot of broken bones and such, which may well be fatal in the absence of modern medicine. With no agriculture, there’ll be no food surpluses, no chance of supporting specialized trades, and no real chance of sustaining our modern knowledge base.
If we’re really, really lucky, enough people might master the skills required to live as stone-age hunter-gatherers quickly enough that the group won’t vanish entirely, but there will be virtually no chance of passing on any modern knowledge to subsequent generations, and any civilization will have to wait till agriculture is re-invented by the great-great-great-great-great-grandchildren of the unlucky 2000.
To make this work, you’d need to (1) give people some extensive tools, (2) give them seeds and domestic animals, and (3) choose people with very specific skills. About 90-95% of your people should expect to be agricultural labourers, and have various basic trades skills (carpentry, smithing, animal husbandry, pottery, and the like) on the side. The remaining 5% should be experts in things like geology (to be able to find valuable deposits of things like copper, iron, etc), primitive mining/metallurgy techniques (to have some hope of maintaining the group’s tools), the manufacture of paper and ink (because we have only a few years to get masses of knowledge into written form before it’s lost), medicine, botany, etc, etc. Even then the group wouldn’t have much chance, but it would have some. The challenge is to produce enough surplus food to support enough people who will be free from food production that they’ll be able to maintain some level of technology and scientific knowledge. Frankly I doubt that 2000 is anywhere enough people to pull it off unless you give them a huge stockpile of tooling and resources at the start.