You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
“Official” in what sense? Authorized/supported/recognized by Tesla? You can’t.
“Official” as in, you want to call a parking lot meeting on the 3rd Tuesday of every other month the “Official Tesla Owners of blah, blah, blah”, just do it.