I use Google Keep for that :). Share it with my wife, we both have the widget in our phone desktops (or whatever the home screen is called). Works very nice.
Oh, God, I have a google apps account on my phone, along-side my regular one, and I once spent three days trying to debug an issue where OK Google had become super-crippled, only to find out it had somehow switched to using my other account.
I don't use it with OK Google, I just type the stuff. All I need to do is unlock the phone, swipe right to the next home screen, click the giant widget and type.
