Sorry for not being clear. This company is the brand, they don't sell other companies liquids, they mix everything in house and apply their own branding. Nothing is made for them and sourced elsewhere. All locally sourced kosher ingredients too. Nothing from China. How they make their base liquids is unknown as they use a clean room and a whole separate building for wholesale orders.
So for one, you can't truly say there flavor extracts are a vg base, they most likely mix their extracts together for all of their particular recipes as a flavor base in vg already steeped and thinned, the thinning would / should most likely be distilled de-mineralised water from Reverse Osmosis with which the mixologist has spent months trying several different %'s to come up with just one base, so my suggestion would be to try thinning several different bottles @ different %'s and shake until it dissolves completely.