All you need is:
6 cups of hot water
3 cups of white vinegar
2 cups of hair conditioner
Mix all the ingredients in a bowl. Use a wisk to mix it together real good. Add to a container for storing and use the same amount as you normally use in your rinse cycle. You can also spritz it on a washcloth and throw it in the dryer instead of a dryer sheet. The smell of the hair conditioner over powers the vinegar and you do not have the strong vinegar smell. I will definitely be using this from now on!
This is what I keep mine in. One batch filled all three bottles to the top and I still had some left!