I've done this ever since I decided I no longer wanted to spend the money on detangler so Aimee could spray it all over her world when I was not looking! I use my old detangler bottle over and over!
Squirt about 1 Tablespoon of Hair Conditioner
Fill the bottle with water
Replace the cap and shake well!
This works great and freshens my daughters hair at the same time! Love money saving ideas like this don't you?