Can hermit crabs have salt water and purified water?

No, hermit crabs should not have salt water or purified water. Hermit crabs are terrestrial creatures and require fresh, dechlorinated water to drink and regulate their internal salt levels. Salt water can be toxic to hermit crabs, and purified water lacks the minerals and electrolytes they need to survive. For best results, provide your hermit crabs with fresh, clean tap water that has been dechlorinated by boiling or using a water conditioner.