This month's charity pick is Water.org, a favorite charity of a number of vloggers. (Flying vloggers out to see, and report on, the conditions in the less-industrialized world is a great advertising strategy.) You can see WheezyWaiter visiting India here, and Hank Green visiting Haiti here. I checked out Water.org on Charity Navigator, where it has 4 out of 4 stars. Also, Matt Damon really is a co-founder. I thought that was just a joke in WheezyWaiter's video.
According to their FAQ, $25 buys one person clean water for life. So, $5 should help at least a little.
[The title of this post was edited on July 30, when I noticed, embarrassingly late, that I wrote "March" instead of "July." -- Watson]