I’m not very particular about the writing place or any special type of writing material.
If you are brimming with the ideas you can jot down with a simple pen, pencil and whatever paper you can lend your hand on. Sometimes paper napkin comes handy also.
Personal computer and a writing-table are bonus points.
I’m lucky enough to have my laptop, a table and good number of pen and notebooks but my main problem is ideas. I sit in front of the computer with a prompt ready but nothing comes to mind. But the moment you switch off the computer , start doing other job the thoughts come pouring in at the most weird time. Sometimes at odd places where you can’t keep pen and paper handy.
Problem is if you can’t jot them down they vanish forever.