I've done a lot of apple juice. I just buy the store brand, add 1# sugar/gal (give initial SG of 1.075-1.080), yeast nutrient, and yeast. I have 4-5 gal aging right now. I really like the flavor and it's really easy. Never used concentrate. Here 1 gal costs me about $3.50-4.00. Biggest problem is the clerks when ya buy 5 gal at a time. Last time I tol them I hate the S*** but the Doc said I gotta drink 1/2 gal a day to clean out my gonads. They didn't have nothin' to say after that.
"Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves." William Pitt