If you're headed to 0, maybe try DIY? The perfumers apprentice has some solid fruit flavors, and I like a lot of the fruits in Natures Flavors coffee flavoring line (in their organics area).
Single flavor mixes are trivial -- just the flavoring at 10 - 20%, and 80% filler PG/VG. Safe chemicals -- these are food flavorings, glycerin USP from local drug stores, PG USP from a TSC store or ordered online.
I can recommend natures flavors black cherry, strawberry, banana, banana nut, blackberry, and though I haven't used it yet their raspberry 3x fold smells good. For TPA their Strawberry and banana cream are solid, I expect other to be too.