Keep a journal. Date entries. Record your actual daily experiences in narrative form. Write well, not just to get it down. Include dialogue.
Then, I can return to the journal and make a book out of it. Maybe some day’s entries were no good—they don’t have to be included. Even whole weeks, months could be cut, but I won’t know what’s good unless I write it all down.
I already have a notebook in Evernote titled “Personal Diary.” I can put the entries there. The title of each note will be the date and a detail from the day.
Currently, I am writing moments—just small snapshots, unrelated to each other. If I’m going to write something longer form, there needs to be continuity, characters, dialogue. I can achieve this by writing in narrative form in a journal, like I’ve said.