Connecting one app over multiple phones

I have an app that I made but I was wondering how I could get it to work on multiple phones as if they are connected. It's a food app so I was wondering how I could update the menu on the app on one phone and have it change the menu on someone else's phone using the same app. Is this possible and how?



you will need a server database 

one phone (client) updates the database and all other phones (clients) read the new data

one possibility is is to use a fusiontable, see the Pizza Party tutorial