Generic sertraline comes in pill/tablet form, you can just use a pill splitter to get smaller increments. I just googled to confirm this before posting, and they're even scored down the middle for easy splitting.
I think far more people might find that they need to taper very slowly if more people got past the first step of tapering instead of just staying on them indefinitely. Many people feel more anxious and depressed on a slightly lower dose and take that as confirmation that they were born needing it, when it might be more the case that their brain has adapted to depend on it. If they were able to reduce more slowly and comfortably this might be more obvious. That matches what I saw with the person I know who is finally doing well on low dose Prozac.
This was the case for me! It took me months to titrate down to 0 from Sertraline. Withdrawal side effects were terrible, and I’m pretty turned off to SSRIs in general now. My past doctors talked them up as “safe”, and treated the ramp down process as a tiny inconsequential mention.
I had tried to stop after stabilizing on a half dose, 1/4 dose, etc., and the side effects were too unpleasant so I had to start back up. I could only stop after I titrated down to 1/8th, every other day.
(Though in theory the contents should be homogenized, so you could dump the powder and take a proportion of it)