I have already written about funding for artists and various mobility grants. Oftentimes, these grants are also available to writers, so it is worthwhile to check out my other posts on this topic. (Searching for Grants and Grants for US artists)
There are also specific grants for writers only that I would like to mention. The first good resource is Funds for Writers. This article by Megan Potter also has some good information. And this post can also prove useful.
As I always say, start locally. Check your local arts councils as well as arts and writing organizations. If you need help funding travel expenses, your country’s embassy in the country you are going to may prove helpful.
If any of you know of any other sources for grants and funding, please feel free to add them in the comments.