Sulfur is acidic! The Biome Water should be Acidic and a Hazard

Sulfur that leaches into water makes it into an acid over time, it doesn't just make it produce toxic bubbles. So, the Sulfur Caves should be filled with Acid Water instead of normal Water, and you should be able to make Acid by leaving Sulfur around it or by crafting it with a block of Sulfur and Water Bucket. When you step into it, it should hurt you over time. Having a damaging liquid that doesn't set things on fire around it could be useful and a good hazard in the caves.