Did you try the table sweetener or an e-juice sweetener? I once naively tried the same sucralose drops I put in my coffee and they did nothing, because those are very watered down (sucralose is extremely potent -- if they didn't water it down, one drop would make a pitcher of coffee sweet).
If you did the same, try the sweeteners many juice vendors sell.
If you did the same, try the sweeteners many juice vendors sell.