Glad to see people using flavors w/o nicotine, So you just fill your bottle most way up with VG then add a few drops of your flavor?
You could but it would be random chance if it worked well. Different flavorings are better at different percentages. It depends on the flavor and company it is from as well. Some times you need very little and sometimes as much as 20%. Best bet is to do a bit of reading around about the flavors you have to see what other people are using strength wise so you have an idea how much you need.