Hey bud.
Phlegm is a tough one to get early on. Since your other stats are higher, you should be able to do some rabbit hunting though. Kill/butcher those as best you can (this of course requires some of the butchery chain of skills to get more meat from them). Rabbit cuts/steaks are decent <20 phlegm foods. Top those off with milkweed and wild garlic and that should be a start.
Now if you want to extend your options a bit, lean rabbit is also a good phlegm food. But the *best* phlegm option you have is making Wild Salads. This requires the Flowers and Berries skill and some fairly diverse forageables, but it's an awesome food.
So:
Rabbit cut, rabbit steak, lean rabbit, wild salad, milkweed, wild garlic.
Gather whatever you can off that list, and then eat it all at once
Edit: Just saw that black bile stat. Time to be really careful to raise your weaker stats, and you're going to need more than just a couple cuts of rabbit to raise phlegm now. Thankfully 95% of the phlegm foods don't give black bile as an off stat.
It's been neat to see the evolution of a game. Salem has come so far, and still has far to go. Although frustrating, I think it's been an experience worth the effort.