Thanks for asking this question. I have come down with something -- I've been feeling increasingly bad for the last 4-5 days, since I took a train out of NYC. In retrospect, I should have done so earlier, or not done so at all, but hindsight is 20-20.

I'm not certain I've got C19, but I'm trying to take actions that would help me if I do.

--A lot of fluids, obviously.

--I'm taking vitamin C in large quantities. There's currently a clinical trial which is testing this; I don't know if it will work out, obviously, but I might as well. (https://clinicaltrials.gov/ct2/show/NCT04264533)

--Vitamin D, for much the same reason.

--I'm sleeping / resting / staying in bed, pretty much continuously.

--I have, of course, a oximeter -- so far, all my readings >= 94, usually 96-97, which seems fine. I might order a second in case that seems innacurate.

--I'm planning to get licorice-tea, and drink it in enormous quantities. This will, in fact, raise my blood pressure, but apparently licorice contains some antiviral agents. (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4629407/)

--One thing that's difficult is that I'm noticing that it's getting harder to think. I'll need to make provision for my future inability to make good decisions.

If people have further ideas, I'd be interested in them. It's a frightening situation for me, although I'm reasonably healthy and in the 30-39 age bracket. I realize that some of the above actions have very small probability of substantially helping, but it's hard to dig up better ones, especially because so many of the drugs used to fight this require a prescription, and currently you cannot get a prescription until you're already basically at deaths door.