Was there about a month ago. Restaurants inside Expo do not have toilets.

All toilet facilities I went to had two sides, one squat, one western, clearly marked which was which. Also had toilet paper, but still a good idea to take your own. Also, lots of sinks. The one peculiarity, not just in Expo but everywhere is China, is no flushing of toilet paper. The septic systems apparently can't handle it. So, the tp goes in the trash can. The stalls seemed to be serviced fairly often, but as the day goes on and the crowds increase, the facilities can get a little aromatic.

There was one large toilet station near India that my friends used, not me. They said it was all squat. So, pay attention to the signage.

Also, no water allowed in, however, take an empty bottle. There are sterile water filling stations inside.