I am sorry I am just now getting to your post. I use to be a coffee drinker but I stopped a few months ago, now I make a big pot and put it in the fridge for no longer than a few days because it will loose it's potency and won't be as effective. But after you take it out the fridge let it sit so it can be room temperature.(it also helps with growth)
you can get you some cheap coffee also and it works just as good.You can get some from a store brewed just ask if it's instant. and you let it sit for 10 mins or no more than 30 and rinse , do not wash out so you should have washed you hair, dc'ed and etc then coffee and rinse and add your leave in after if that makes sense.