A couple of places:
Alchemy Kombucha -- offers vegan dishes and dishes with meat, and they're all outstanding. It recently got a great review in the newspaper. http://www.alchemysanantonio.com
Moshe's Golden Falafel -- all-vegetarian and you can easily make it vegan by leaving off a yogurt sauce. https://www.facebook.com/pages/Moshe...51837781660856
Enjoy your visit!