Is there any one word which can describe everyday things?
By this, I mean things we commonly regard as things most people do every day, like taking a shower, brushing your teeth, getting dressed, going to work or school, and eating dinner.
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"Quotidian" is a good word, although it may be a little too highbrow.
quo·tid·i·an /kwōˈtidēən/ adjective -Google
Of or occurring every day; daily. Ordinary or everyday, especially when mundane.
The word mundane can be appropriate here, as it can be used to refer to things that are common or ordinary. Brushing your teeth or taking a shower are indeed mundane activities. Note that this can have a bit of a negative connotation, suggesting that the activities are common enough to be boring. If you want to avoid the negative connotation, routine (as suggested by gbutters) may be a better choice.
May I have the opportunity to add my version of the (not so) trite word:
Also consider a word called:
usage: "..my daily chores"
Not to mention that the accepted answer is laconic in that I personally prefer its usage.
"Jim got so engrossed in watching the soccer match that he forgot the quotidian task of watering the plants."