I used Grape. When I made the first batch I followed the directions I found here and did 10ml VG, 5ml Water, 5ml Grape Flavoring.
The post I had said that the mixture was 2 to 1. Exact words were something along the lines of "for 1ml of VG add .5ml of water/vodka and .5ml of flavoring".
Tried it, tasted like nothing and was really thing. So I tried a little more VG and it tasted like nothing, then tried to add a bit more flavoring again, tasted like nothing.
I'm not sure what I'm doing wrong because this is my first ever attempt at it.