I don't usually donate to charities because the vast majority of the donation never actually goes to the cause it was donated for in the first place. However, I try to give cash to the homeless as often as Ican. On my drive home I frequently see homeless people and I try to give money and also bottled water that I usually have in my car. I don't know what they'll use it for, but it's something I can do right there and then for them and I know they at least have the opportunity to buy some food / necessities, and I know they have water.