This is a very good example that not everything found on the WWW is true. It may be understood that way in "certain circles," but here we also have the so-called context.
By the way, Wikipedia provides an explanation for Teilchen (pastry) but by no means for Teilchen (drug).
I just wanted to briefly point out that there is also the possibility that this term is perceived differently. I haven’t checked how old you are, but I have known the term for at least 10 years through some classmates and friends whom I lost due to intense drug use.
Until now, I did not know the term for pastries, thank you for that.
But back to topic: I would personally provide water crates and 0.33 glass bottles of cola, etc. The idea with the coffee machine is worth its weight in gold.