My first brews were just this, I'd go shopping and check the juice section for any that didn't have any stabilizers, from there I'd add enough sugar to bring the potential apv to 13%ish, add some tannin and yeast nutrient, I haven't had to add any acid as the juices so far have been pretty acidic. Usually I'd end up with an(in my opinion) alright wine. You're not going to be making any amazing wines doing this but you can't beat making a gallon of drinkable wine for like 5 bucks. While I'm still a novice making hobo swill toilet wine I'd recommend anyone trying out the hobby to try some juice wines. They're cheap, easy to make , and great practice for the basics so if you screw up and a batch gets contaminated or just turns out nasty you're only out of a few bucks, less than an hour of labor and however long you let the wine age.