The highest level of tzedaka (charity--the same word root for righteousness) is where you never find out who receives and the receiver never finds out who has
given. In the holy Temple there was a large box where people would drop off money and the poor would withdraw it was impossible to tell the donors form the
receivers. In modern Jewish religious communities a Gamel Chesed (carrier of kindness) will deliver food packages on a regular basis as a family in hard times
needs, these families will likely find envelopes of cash appear in coat pockets or under doors (rent the family friendly movie Ushpizin http://www.ushpizin.com/ to get a better idea of how it works). It is considered evil speech to finger out a person who is known for giving tzedaka directly as he might be mobbed by the poor and depleted. This delivery also keeps the poor from feeling beholden to their known donors.
In a survival scenario the ancient wisdom of an anonymous surprise gift of supplies distributed by a designated messenger (like The Postman) will reduce the danger of you becoming known as the house with supplies to be constantly begged or raided. Always remember as I have said before your responsibility bulls eye starts with you in center-then wife and kids, other family, neighbors, more distant victims, and so forth.
The writers of the Tehillim were holy men who inspired by the Almighty wrote poems which were meant to among other things invoke the trait of mercy from the
Creator. It has been a constant that in times of trouble we have resorted to prayer, fasting, and charity to overturn a harsh decree against us. Tehillim falls in the core of our appeals to the King of the Universe. When expressed in Hebrew they are at their most potent and beautiful. I (with no financial or other interest) personally recommend one of my favorite artists singing these as I would imagine David the king or the Levim in the Temple would have. See: http://www.israel-music.com/yosef_karduner/ or do a web search for Tehillim for other artists. BTW, I always carry either my larger prayer book which contains all of Tehillim or a small pocket size compendium that measures about 2" x 3".