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I'd say No, you don't need to write every day, any more than you need to practice any art every day. You work on it when it's comfortable to do so, in order to devote your undivided attention and focus to it.
If you know of a section of a book (or any project) that will require your focus for an extended period of time (in order to not lose trains of thought from start to finish), you should plan to set aside that time, and attack the project then, when you know you can finish it. However, in many cases taking down notes will suffice to keep your ideas on track between sessions.
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