I mix my own tick spray/soak solution. I use Duration Permethrin 10% concentrate. According to the directions you use 1/2 oz. of concentrate in 18oz. of water. I mix the solution according to the direction and use it as a soak.....will treat 1 set of cloths(t-shirt & pants). You put the cloths in a big zip-lock bag (2 gal. bag), add the solution, let them soak for 2-3 hrs. and then hang them to dry. Here is my question.....does it really matter how much water I use??? I'm using the whole bottle of the mixed solution in just one bag. What difference would it make if I used 1/2 gal of water to 1/2 oz. of concentrate. After they cloths are dry, wouldn't I still have 1/2oz of concentrate that has been soaked into the cloths??? Am I missing something?? I realize, that if I was splitting the solution in 2 different bags, I would want to keep it at the right concentrate.