Hi Gel,
You don't say if you have/use nicotine. I assume your 10ml bottle of mocha has nicotine in it already? Adding Glycerol will cut down not only the flavor, but also the nicotine level. Concentrated flavorings are best to use to boost flavor and not cut the nicotine level (if used).
The best way to DIY is to use a calculator to help get accurate nicotine levels and good flavor. Try this one on line:
eJuice Recipe Calculator
or if you have Excel you can download ScubaDan's to your computer
FilesAnywhere - FileShare Detail View
Having some different flavorings would help you. One member from Australia reported that they used a brand from the grocery stores made by Queen food flavourings. You can use a few of these, but not all of them. Check the ingredients. If they contain no sugar, and first two listed ingredients are 'water, propylene glycol', then it will be fine to use. They used chocolate, orange, coconut, rum and strawberry.
LorAnn flavoring can be found on eBay in Australia as well from one dealer.
eBay My World - roughness
More tips on DIY can be found in this section of the Forum:
DIY e-liquid - E-Cigarette Forum
Don't forget to DIY safely and use eye protection and cover your hands/arms from potential nicotine spills.
Happy DIYing!
