With unflavored nic you can pick up some flavors there and just add a couple drops to the REO bottle! It really is simple! One 6ml bottle and a couple drops to taste!
DIY is fun and the cost is right!
This is what I do as well. Really simple and allows for easy flavor changes. Fill up the 3/6 ml REO bottle with unfalvored then add only a couple of drops to taste as the flavorings are very concentrated. I can tell a BIG difference in flavor between adding 4 drops vs. 6 drops in a 3ml bottle! I've gotton flavorings from WL as well, Capt. Black, RY4, Mocha, Graham Cracker, Butter Rum. I love them all and it's fun to experiment mixing flavors to create your own special blend. I can get a cheap kind of Bobas Bounty clone mixing my graham cracker & mocha together.