I store my wood shafts inside (the house) tightly rubberbanded on both ends...
Your shafts are not that hard to straighten.. You can spend alot of money on "tools" but they are not needed.
I straighten by hand. Sight down the shaft finding the bend (you can also roll them on a flat surface), apply pressure on the opposite side of the bend with the meaty part of your palm. With a badly warped shaft you may need to apply heat to get the shaft to straighten.
A little practice and you will get good at getting the shafts close to perfect.
Remember that your wood shafts do NOT have to be perfectly straight like a carbon shaft. If your nock is installed properly on a "relatively" straight wood shaft,,,, it will fly correctly.
John III