the head is s s m t w th f s s m t w th fr su
which is basically two weeks saturday sunday monday etc...

narrow the window down to, for example 7:pm, allow yourself between 6:pm-8:pm to check off the checkbox.

so set a time, say 7:pm and give yourself a window and make a habit of it... mark it off once youve taken it, but narrow it down with a window so you're not asking yourslef at 7:15 'did i take it' and end up wondering if you're double dosing or considering skipping it.