Put together a bag of things like travel size deodorant, soap, toothbrush/paste, bottled water and some nutritional snacks like energy bars, raisins, fruit leather, etc to keep in your car, in case you come across someone who is homeless. My personal fail was that I put some chocolate cookies in there... not conducive to leaving the bag in your car. :-/ I also added $2 to mine. Not a lot, but enough to make a phone call, take the bus, or buy some food.
And no, I haven't found anyone to give it to yet.... :(