Last year I ran the NYC marathon, my sister travel with me from Mexico.
She had celiac disease, so, Google Maps and the Local Guides COmmunity was the best tool to find, save and share gluten-free spots in the city.
I share that list and several people said was really helpful: https://goo.gl/maps/M9yXYrGtRnG8pNhh7
Is really interesting and helpful to use tech to help everyone others life.
List open to suggestions.