 How does Johnson trick the duo into paying for things more than once?
"On account of the quantity, I'm able to quote a bargain price. Shucks, boys, it hurts me more to charge for water than it does for you to pay. Then Johnson rubbed his thumb on his index finger and wetted his lips expectantly. "Johnson, as I saw instantly, is the victim of a difficult environment, and must charge accordingly." "Just the same," Joe griped, "paying for water isn't something you can get used to in ten minutes." In the fragile forest, they soon came across a stream that sprang from the igneous soil and splashed into the small pond whose contents, according to the mayor, was theirs for the asking.
 He is dishonest. He offers something for free, without mentioning the actual price of it or that there even is a price.
 He strong arms them into buying with his son.  He is dishonest. He offers something for free, without mentioning the actual price of it or that there even is a price.  He takes advantage of their good will.  He doesn't trick anyone - he is an honest man that is running several jobs.