Crockpot Pork Stew with Cider

"I started off with high hopes for this stew, given another cider stew a made a few weeks back, but my heart started to sink after putting allt he ingredients in my crock. There is so little liquid in there! Now, I thought that this wouldn't be too big of a big of a problem, knowing that all the juices in the meat, potatoes, and apples would come out into the stew, but I do believe I was right to worry. After cooking the stew for the time given, the pork was nigh on bone dry, which would have been okay if the gravy could make up for it. Well, I have on thing to say: vinegar. That's really all you can taste. I'd call it an earthy vinegarry flavor, and that isn't suited to my palet. Maybe if there was something salty in here, like bacon, that would make it better. But it just overwhelmingly tastes of vinegar. That said, the stew is okay. It isn't inedible, but it isn't something I'll make again. Some tips: less vinegar will probably go a long way, or consider adding something salty in to cut the vinegar a little. I don't know what could be done about the pork...I do presear it, as I usually do, so maybe don't do that?"