I’d say just take up a collection among your friends. You don’t need to tell them who it is.
Once in yeshiva one of my friends was collecting money for a guy who needed therapy. I gave him 100 buck. I have no idea who the guy is; he wasn’t in my yeshiva. (Or so I was told, though I don’t know that either. It could even be my friend was just collecting to buy himself a new minivan.)