What do you do about pumping of you will be away from the office all day?

I just found out I will be on site pretty much all day for the next two days. I don't drive so can't pump in the car. It will be at a hospital so no single private bathrooms to pump in.

Worst part is I have no stash and have had horrible pump session today. Ugh I don't want her to drink all formula 2 days straight. Not to mention engorgement ....

Help!