Whoa, sweetie, you DEFINITELY don't need 4oz of sweetener! Usual use is 1 drop per 3-5mls of juice, that's enough for a couple of YEARS
Koolada is usually used 1 drop per ml.
I don't want to insult you, but you do know 1oz is 30ml? A 30ml bottle of eliquid, even mixed at 20% flavor, is only 6mls of flavorings.
Unless this is all you're going to vape for the next year or more, I would go with smaller sizes from Wizard Labs. You can also get all the syringes, bottles and cylinders for the lowest prices I've seen around. John will also sell larger sizes of flavorings if you send him am email.
Just my