Nothing wrong with bottle feeding. You can sign up with the various manufacturers and they will send you a shit load of free stuff. The app is just a good way to track things, NOT to evaluate the quality of what you are doing and if you think that’s what you are going to do, avoid it. Parents have done without an app for thousands of years. We just used it because we didn’t think ours was feeding enough so it was a good way to have the info for our doctor.