I think you can go frugaler. Make it 1-ply, cut it into thirds. Should last a month.
From the submitter:
I am in IT. Our bathroom light burned out. We have no extras but got a USB light!! Wall power to PSU to motherboard to USB port to USB light! FIXED!
Now all it needs is a bunch of dead leaves!
After clogging the toilet with his paper towel idea, he vowed to never run out again.