Or maybe just “really wants”. Do you have to listen to a certain style of music when writing a certain genre? Do you need a cup of coffee handy at all times?
When I was younger, I had to have black ink pens and college rule notebook paper kept in a three-ring binder. I still prefer writing that way, but if a writing opportunity arises, and I’ve forgotten my binder, I’ll write on anything.
What are your writing must-haves?