Water, water, everywhere, and not a drop anyone wants to drink. Last week’s episode established that the dome has its own mini ecosystem, as a sudden rainstorm ended the building panic about a water shortage. But why weren’t people running around placing buckets to catch the rain? Oh, well, tonight they focus on the problem a bit more intently, as Big Jim (Dean Norris) confronts Ollie on his stranglehold of the town’s remaining water supply.