Hello derunderhoodrawks and Welcome to ECF.
You don't really Need to add sweeteners to diy, it really does depend on taste. A friend of mine loves supersweet
juice, me not so much.
You don't have to add stevia you can also
buy Sweetener Flavour from The Perfumers Apprentice or use Ethyl Maltol Crystals and dissolve a little (10% ratio) into your DIY mix. But I'd say vape without sweetener first Then if required add it.
Best of luck, and have fun.
