I can't remember the exact recipe, but there's a recipe for conditioner using BTMS (aka emulsifying conditioner) that watered down further, works quite well.
It was something like:
85% distilled water
4% Aloe Juice
6% BTMS
5% Vegetable Glycerine
Pinch Rosemary Extract is always good for the hair
Preservative
I would try watering this down by 50-75% for a spray in conditioner. Anyways, play around with it, but it does work. You can of course add in other things great for hair as listed above by someone. I've read that marshmallow extract (or something like that) is effective.