Expandable fluid storage: Connecting Cauldrons

When placing cauldrons adjacent to one another, they should connect and share storage, becoming like a "tank". Still stores just as much fluid per block as manually filling the same volume with fluid sources, but with the advantage that the content "flows down" to the ones at the bottom so you don't have to use complicated architectural tricks to fill out the space. Dumping buckets into any cauldron connected will add fluids to the same cumulative inventory. Only one fluid type at a time however. Good for storing lava with less chance of fiery accidents.