Here's the answer:
“我每天写故事”
(wó měitiān xiě gùshì)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- wó měi tiān xiě gùshì
- wóměitiān xiě gùshì
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 97.63% of the time!