I recommend the double shot kind for added liquid carrying capacity. The latest gear in drinking water on the fly is the bladder-type hydration systems, two brand names being CamelBak and Platypus. A long tube allows for hands-off draughts of this precious fluid. They carry more water than a water bottle and they are slosh-free, letting you enjoy the sounds of nature, not your noisy gear. In addition to carrying water on your person, please think about adding a small bottle of iodine tablets in your fanny pack in case you run out of water.
Many runs have running water near.
You do not want to play host to parasites like Giardia and Cryptosporidium, unpleasant intestinal guests. Consider yourself warned. Also, put a water bottle, with a few ice cubes for fun, in your car for the post-run drive home. I cannot overemphasize the importance of keeping well hydrated. In the alternative medical world, naturopaths consider dehydration a leading cause of many chronic maladies.