κς

So, the easiest thing is actually the notepad. You use it as much as you like and only later you scim it and look for gems that might be worth to be published or rewritten. It’s a kind of typewriter. You don’t need any Internet connection. You just type in and enjoy your freedom. After your time of brainstorming or journaling you go and clip out what you’ld like to make public.
I assume that most professional writers work that way. They would in rare cases only directly write into the print. They collect masses of written raw material and do something with it.