Water Collector

There are seven Water Collectors in Poison Cave Dungeon:
 * Water Collectors 1 and 2 in Room 2
 * Water Collectors 3, 4, and 4a in Room 4
 * Water Collectors 5 and 6 in Room 6

Each Water Collector will take a Jar with pure water and convert it into a Jar of Ultra-Pure water, which can be used on Poison Pools. They will do this some number of times (differing with each one) before they are exhausted.