Am I the last person on earth to learn about this?
To make your own cooking spray, you need a spray bottle, 5 parts water and 1 part oil!
Seriously. That's it.
Just make sure you shake every time you go to use it.
Wow, another item I won't have to purchase!
And just think of the oils you could use. Olive, Canola, Vegetable, Peanut. You name it, you can use it!