Testing at work?

Hi ladies, I've been on glow for a while but within the past month I've sort of fallen off. I have been testing or taking my temps each morning like I used to. I want to get back into it but I just started a new job. How do you ladies test at work using a cup in a bathroom with multiple stalls? Do you use disposable cups? Any help to get me testing again will be much appreciated! Thanks you.