I don't think anyone answered your question about the app. Yes, there is one that you can use, a lot of people do. Anything that keeps you in touch here on SR is going to be helpful to you.
The primary way to face the problem of drinking is not to do so and to plan on what you will do when your mind is telling you that it sounds like it's okay to do it. As Dee said, it's really pretty simple, it's just not easy at times. I hope that you find the right path that is going to give you sustenance for being sober, it is doable. For me it has been a combination of strategies to figure out what really works for me in various situations, but support from others has been a big part of that.
Peace.