Adam Clarke Bible Commentary

We have drunken our water for money - I suppose the meaning of this is, that every thing was taxed by the Chaldeans, and that they kept the management in their own hands, so that wood and water were both sold, the people not being permitted to help themselves. They were now so lowly reduced by servitude, that they were obliged to pay dearly for those things which formerly were common and of no price. A poor Hindoo in the country never buys fire-wood, but when he comes to the city he is obliged to purchase his fuel, and considers it as a matter of great hardship.