Treated waste water is very commonly used as well. Just not normally for vegetables intended to be consumed fresh. Its mostly used to grow animal feed and non-food agricultural products.
Ah yes, voting is always effective. Thank goodness people in Germany kept voting in the early 1930s. Imagine what terrible things might have happened if they hadn't.
For one, caffeine is a known adenosine antagonist. The effects of adenosine is described as "drowsiness" or "relaxed".