How to Set Away Messages for Texts and Other Apps

Going on vacation? You probably already know how to set an out-of-office auto reply for your email. That's great for letting your coworkers know that no, you cannot make it to that meeting, because you're off sipping mojitos and sunbathing in the Caribbean. But what about when your friends text you? There used to be easier ways of telling people we were "away" from your devices.