What's the purpose of the water jug, to act as a reservoir to replenish the level in the mason jar or...? Also, I don't understand how the fogger works. Is it attached somehow to the mason jar as a stand-alone unit or am I missing something? The abstract escapes me, in that I failed geometry in high school, twice, and finally passed with a D, if that tells you anything, lol! Sorry, I'd just like to understand if you don't mind dumbing it down, lol!