What little extras would you throw in? EM, vinegar, lemon juice, saline, smooth, sweet and tart? I think it is the little extras that make good juice great juice.
What you mentioned are really concidered additives to make adjustments and help fine tune a mix.
Vinegar is for tobbacco so stay away from that with fruit.
Lemon juice is said to make it pop and prevent flavor fade so that would be a good choice at 1 drop per 5ml or 1%
EM will sweeten so steep it first taste it and if you feel it needs to be sweeter then add at 1% increments until sweet enough
Smooth is a tobacco product used to blend a tobacco mix when 2 or more tobacco flavors are used it's not good for fruit.
Sweet and tart I've never herd of but if the name indicates what it does I would stay away from that. You really don't want a tart peach.
Saline and distilled water are used for an all VG mix to thin it. Saline may add a little salt taste to it so be careful with that.