Willard Water
If the bite is a bad one where it has left a hole in the skin that has not healed (as often happens with Brown Recluse spider bites,) then mixing the diluted Willard Water together with a teaspoon of Slippery Elm Bark into a poultice and applying it daily to the wound–protected by a bandage, is the way to effectively treat the bite. I once treated a bite like this that had been an open wound for three years! It healed in about a month.