You are pretty much stuck with organic dehydrated fruit if you want to avoid the sulfur dioxide (which, IMHO, makes the fruit taste horrible).
For those living in the Pacific Northwest, the bulk bins in the Fred Meyer stores' organic section are, IMHO, the best source. My favorite is the dried Turkish apricots--yummy! They are also cheaper (and, IMHO, taste better) than Trader Joe's (probably because they're sold in bulk, not packaged). However, for trips longer than a night or two, I put them into my dehydrator for about 4 hours to remove more of the moisture. I've seen the identical organic Turkish dried apricots at other stores that carry organic food, such as Whole Foods and the local New Seasons chain, but costing at least $1 per pound more. Unfortunately, though, Fred Meyer's source sugars the mangoes!
For long trips of a week or more, I use freeze-dried fruit which is a lot lighter. Most of it is very tasty, especially the berries which I add to my breakfast cereal. Of course, it's far more expensive!
If you are dehydrating your own fruit and don't want to use sulfur dioxide yet can't stand the sight of brown fruit, you can try dipping the fruit in lemon juice just before putting it into the dehydrator. Of course the fruit will then taste like lemon, but that's a lot better than sulfur dioxide! It won't come out with the original color like the SO2-treated fruit, but it will be a lot less brown than untreated fruit. I personally prefer the untreated, though.