Jotting down some ideas? That counts as writing, since brainstorming is an essential part of the writing process.
Taking a shower or bath? That’s letting your unconscious brain do some work, so it definitely counts as writing.
A long walk? Yes, same as above, totally counts as writing.
Attempting to locate a pen that actually writes? That’s pre-writing, which is writing.
Wandering around a bookstore and thinking about all the effort each author put into each book, not to mention the agents, editors, designers, proofreaders, and booksellers, and then getting a half-caf iced latte with oat milk and not buying a single book, but adding a bunch of books to your list of books you plan to borrow from the library? That counts as writing, yes.
Some light gardening? If you think about gardening metaphors while doing it, that’s writing, for sure.
Commenting on a Buy Nothing post about a free lawnmower? That’s writing.
Reading a Substack post about writing every day? That is absolutely writing-adjacent—so yes, it counts.