Link to Direct Relief Bitcoin donation page:
https://www.directrelief.org/bitcoin/

A little bit(coin) can do a lot

Bitcoin makes it possible to donate and avoid the hefty transaction fees normally applied by big banks and credit card companies. This makes it possible to donate $0.05, $5.00, or anything you feel comfortable with. Every bit of your donation will count.

Minimize mining fees on your donation, and all other transactions by checking the most recently mined block

List of more ways to donate to Hurricane Harvey Relief

~B-Fire
#nurdthug

Sources:

https://steemit.com/harvey/@rowlow/nurdthug-news-harvey-s-monstrous-monetary-toll

http://www.morningstar.com/advisor/t/120319221/update-how-to-help-harvey-victims-with-bitcoin-and-diapers.htm?&single=true