Go to Walmart and get yourself a cheap bottle of Vinegar. Add vinegar to some warm water. You might get a pair of gloves on for this. Now mix 2 cups in the bath water. Now bathe the cat. This will kill all fleas, ticks, and eggs. It is a quick, cheap fix. Keep the cat inside till you can afford...
Has the vet tested for Tapeworm? Slippery elm is for diarrhea. That is what I give. I also boil a chicken. In a small cat bowl put one soup ladel of the chicken broth in the bowl, one tablespoon of pumpking. Not the pie filling type, but pure canned pumpkin. Let cool and serve. They will drink...