Kava for ready to drink beverage

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I'm developing a kava based ready to drink beverage for sale, following a couple of decades of enjoying kava at home and when visting/living in Vanuatu. I am experimenting with using kava extract (30%, nonsolvent, watersoluble) but have read some things, including on this forum, about whether using kava extract is a good idea as not enough is known about their effects as opposed to the extensive body of literarture on traditionally prepared kava. Would welcome folks thoughts on this, and whether it is feasible to make ready to drink beverage with the kava powder or instant kava powders out there? If anyone has links to larger-scale reputable suppliers of kava powders or extract, preferable close to where kava is cultivates please let me know (for refrence I am based on the West coast of the US). Thanks!