Most of the store bought juices contain fairly low amounts of preservatives BUT, just as important look at the other ingredients and be sure they are what you want in your wine.
Finally some of the ready to drink juices are a bit watered down and therefore will produce less than great results. Look more toward concentrates like frozen juices that call for adding 'X' number of cans of water. That allows you to use less water and get a better flavor - e.g. Directions call for 4 cans of water - you can add 3 and have a better tasting wine. Also lookout for fruit wines that are labeled as say Raspberry - Pineapple but in fact contain Apple, White Grape, Raspberry and Pineapple juices. Those juices are going to be listed in the order of the most dominant first. So in that example it's mostly Apple and White Grape juice with enough Raspberry and Pineapple to give that flavor to you. In fact you may even see a juice that lists High Fructose Corn Syrup in the first 1 to 3 ingredients - so you are actually paying a lot for corn syrup. I'm not saying that a mix is all bad, but sometimes in wine making a fruit flavor seems to diminish as the wine ferments. So you'd probably not be terribly happy if that Raspberry - Pineapple wine tasted more like an apple wine when all is said and done.
Most of all if you can follow some well used recipes you will probably be happier for the first few batches of wine. (There are plenty of folks who have tried and true recipes for using store bought juices.)
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