Analogy: "However, bottled water us ultimately a Band-Aid solution." This analogy really works well because everyone knows what a Band-Aid is. No matter if you are 5 or 105, you have used a Band-Aid and you know the effects of one. It really hits home that its just covering the problem up and not treating or curing the problem. It is a temporary fix before something bigger can be done to solve the problem.
Allusion: "In an eight year period, from 1989 to 1997, four large companies including Wessex, (a former subsidiary of Enron), were prosecuted 128 times for various infractions." This is alluding to the Enron scandal a few years before this was published and getting people to associate bottled water with corrupt corporations. When people think of Enron, they think of failure and fraud and that is what they chose to associate bottled water with.
Simile: "Taking away your water is like putting a gun to your head." I think in some ways that this is both a simile and an overstatement making the author less credible. Yes, if you do not have water you will die, but putting a gun to your head seems so out of place in this article.
