Hi Dormouse, check out Vapor-Renu. They can custom blend (if they need to) for you and it's inexpensive. For your flavorings, I suggest Capella's Flavor Drops. If you want to buy small sample-type flavorings (before you buy the lg size), Pure Vapes has them. Nikhil might even have some bottles, not sure. Liberty-Flights has the 6ml bottles I buy and also the larger FlavourArt flavorings.
Here's the way I do it. I mix up my blends to where I want them (I do full DIY). After that, I store it in several 30ml bottles. When I want to make up 4 or 5 small bottles, I syringe 6ml into 6ml bottles (from Liberty-Flights), then I just simply add the Capella's flavoring to my taste. With the Capella's, you don't have to mix several flavoring for many of them. It's already done for you. Examples are: Chocolate Coconut Almond (Almond Joy bar); Double Chocolate Mint (Jr. Mints); Apple Pie (yummm); Orange Creamsicle (hugely addicting); Peaches & Cream; Strawberries % Cream; and the list goes on.
Take care and have fun,
Seabrook