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I have gone on 2 trips with Ritz. There is no toilet on the bus. They will stop at rest stops along the way, and there are always restrooms at the restaurants and other stops. Bring some tissue and/or toilet paper.
There is no toliet on tour buses. We have backpacked in many places and never see toilet on buses except from Kunming to Dali, they have big Benz buses with toilet, but they locked it.