I am in possession of a jar of apricot preserves, all natural, no added sugar. Could this possibly be used?
Personally I would stick to fresh fruit or something less processed myself like dried or pureed fruit, BUT thats just a personal choice not based on anything other then my preference.
When I made my blueberry wheat beer, which is freeking awesome

, I used dried blueberries right into the secondary, then racked on top of them and let the sit for a few weeks. I boiled some water, threw them in after turning the heat off and let them sit until I was ready to add them. I added the water they were sitting in as well because I didnt want to lose any flavor.
How much fruit or honey puree do you add to the secondary?
How much of the fruit flavor do you want? I used 2 lbs of dried blueberries and ended up with just a hint of the blueberry tastes, but for me it's exactly what I wanted. I wanted a ale that was a wheet ale with just a afterthought of blueberries. I have had more then a few of Lienies Berrywiess and to me it was too sweet and wanted to avoid that. Check out the recipiator and look at some of those fruit beer recipies some of them add a LOT of fruit some dont. Your best bet here is to make a batch and then tweek it while making sucessive batches to get it just the way you want it.
You will either need a 6.5 gal. secondary or a blow off hose then because the krausen needs someplace to go.
I agree here. I never thought about it when I made my batch but you are adding a pretty decent amount of sugar back into the beer and your yeast will throw another party in there, so be ready for it. Also dont expect to bottle your beer anytime soon because after the party you are going to have to wait for the mess to settle out and you'll have some extra floaters from the fruit. My "Fruit Floaters" never really seemed to settle much but I bottled anyway. I figure that if you bite into a piece of cherry pie and hit a pit you know it's real cheeries in that pie . . . so if ya get a tiny blueberry floater in your bottle of beer you know it's real blueberries.