Yes, the tap water on all Royal Caribbean ships is 100% safe to drink and often higher in quality than standard municipal tap water on land. The water is produced on-board through reverse osmosis and multi-stage flash distillation, which removes impurities and salt from seawater, followed by mineralization for taste and chlorination for safety. The ships must adhere to the strict Vessel Sanitation Program (VSP) standards monitored by the CDC, which include regular testing and inspections. While the water is safe, some passengers notice a slight "mineral" or "chlorinated" aftertaste compared to their home water. If you are sensitive to this, you can bring a reusable bottle with a built-in filter. It is worth noting that while the water in your cabin's bathroom is the same as that served in the dining rooms, it may not be as cold; filling up at the filtered water stations in the Windjammer buffet is a popular way to stay hydrated for free.