The word 'everyday' is hardly ever used correctly. Some of the few people who do use it in the appropriate way, are those who wear special clothes for particular purposes.
When I was growing up, my mom would insist that I wear 'Church clothes' to church, 'school clothes' to school, etc. There were Play clothes to play in, party clothes, shopping clothes, and so on. So now, if you visited a friend, and discovered that their mother was celebrating a special birthday, you're in a fix. You did wear visiting clothes, but not special party clothes. "I'm sorry; I just have everyday clothes on! I didn't know it was a celebration!"
Here everyday means non-special. Everyday clothes are those you wear every day, so non-special. You wouldn't wear those to a party, or celebration. Of course, your friend's mother would take you by the arm, and say: "Oh, you look perfectly fine. This isn't a serious party, Kay, it was just an impromptu thing the kids decided to do."
In this instance, you just can't use every day for everyday; the meanings of the two expressions have grown apart for too long. Nor can you use everyday for every day. If you want to describe the coffee you drink every single day, it had to be every day.
There are other words like that, which started off being phrases:
Hereafter.
Anymore. Anyway. Anyhow.
Undergone, underdone, undertone. Underweight.
Overwrought. Overeat. Overweight. Overcome. Overdo. Overheard. Overhead.
Pickup. Dropout.
Pocketbook.
Look them up in a dictionary. They're difficult to explain!
Kay
P.S. Hey, what's with using apostrophes to denote plural's? Just stop it, ok? :)