A toilet bidet system for use on a passenger transportation vehicle. In particular, there is described a bidet rinse ring that converts a standalone toilet to a combined toilet and bidet system. Designs find particular use onboard passenger transportation vehicles, such as aircraft. Such systems benefit from efficient space management and generally cannot support a separate toilet and bidet. The bidet rinse ring described herein may come factory-mounted on the toilet. In other examples, the bidet rinse ring may replace a standard rinse ring in order to retrofit an existing toilet.