I started out using juice (read: Every time I see a new type of not-from-concentrate, preservative-free, preferably unfiltered apple juice, I buy a gallon), no nutrients or sugar added, just pitch, rack, ferment dry, and bottle carb. The advantage to that is that it's fast and easy, available year round, relatively cheap, and perfectly drinkable. I have also bought boxes of fruit from a fruit stand and either juiced or blended it, heat pasteurized, then pitched, etc. I find that the fruit leaves more of the original flavor, even with heat pasteurizing, and those have generally been some of my better batches, but of course they cost 3-5 times as much and require more effort and time up front.