You poor thing!
Some famous architects still draw with pencils of many sorts or ink pens of many sorts... even now. Well, I figure those each have their favorite pencils and pens.
The best architecture tool set of all times is a pencil and an eraser.. no, not a little stub at the back of a pencil, although that can work if you are desperate. In the context of fast drawing and thinking, erasure can be a strong mark, giving verve to a drawing.
Meantime, welcome, vicky.
Edit - well, maybe a stick in sand wins out. Ball point pens and napkins are good too.