Everyday is an adjective: ordinary. Every day means each day. Everyday shoes. She runs every day. Diction as a set is in word choice.
Ordinary versus each day
If you can swap in ordinary, write one word. If you can swap in each day, keep the space. Everyday I walk is the usual miss.
Maybe versus may be is another split-or-join pair, in maybe versus may be. Already versus all ready is in already versus all ready. Grammar overall is in ACT grammar rules.
The bottom line
Ordinary: everyday. Each day: every day.
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