Kava with alcohol withdrawal and drug tests

I recently just quit drinking and have gone into a treatment program. I’m five days sober and the withdrawal symptoms haven’t been too intense and it seems I’m just about through most of the acute symptoms. I wanted to pick up a kava tincture to help with the anxiety from quitting, but I’m wondering if that could possibly mess with my withdrawals and set me back. I’m also drug tested randomly once a week and know many tinctures contain alcohol. I know it’s a small amount, but am worried it could be enough to make me test positive for alcohol. Could anyone help me figure this one out? Or any other thoughts? Anything is appreciated thanks