Do I need to be artistic to attend?

Absolutely not! We have zero attachment to end product but focus on the sensation of creating. You could scribble, finger paint or simply make repetative lines on the page. The point is to allow yourself to create.

What art supplies should I bring?

Whatever you feel called to is perfect. Paper, pencil crayons, markers etc... Notice what feels good in your hand or what you are curious to explore. Start there :)