op I guess I am not understanding your question.
You are looking for a recipe/formula for making/mixing a vrey concentrated formula that you can later just add water to by using the garden hose with the dispenser/sprayer?
SO are you looking for a homemade formula/recipe or asking about products that you can purchase?
And it may be helpful to know what you are spraying, how much, how often ect.
And also just a little tad that I know you know but is always a good reminder ... If you are mixing a solution poisonous in a container that is not an original container, be certain to mark it clearly, and that it has child proof lid and is locked in a secure area away from pets/children as concentrated solutions are far more dangerous even than the watered down versions.
