Just get the words down
I totally agree with Notes from the Underground:
My advice? Write whenever you can. Don’t worry about the word count. Just get the words down. Even if it’s only sentences here and there, you’ll be surprised at how influential those few sentences can be on your writing habits.
The best way I've found to write on my blog is to jot something down when I can, putting my thoughts together without judging how much (or how well) I've written.
May the flow of writing be with you! 😉