You can just press Option + 8 (on a mac). I believe you press Alt +0149 if you're using Windows.
Don't press the "+" key, just press Option, keep it pressed while you press 8, then release (likewise for windows).
I found this info by searching google for 'keyboard shortcuts to insert a bullet point' after seeing the best answer was using css, that isn't as simple as it seems for some of us. I have a Mac and it worked perfectly (even after publishing). Single spaced with a bullet. Viola!
( @atthomas has probably already figured it out by now, but I hope this answer helps someone.)
Note to 'the powers that be': this shouldn't have taken me so much time to research a work-around. I should be able to format a paragraph to look however I want without having to add a css, html, etc.