There is a company that makes a product called Polar Pure, which is a backpacker's water purification system. Some people think very highly of it, and consider it superior to the other options for this. Unfortunately, because some of the methods for making meth involve the use of iodine, and Polar Pure uses iodine, guess what? California and the DEA have decided that iodine is therefore a controlled substance, which will put Polar Pure out of business.
Meth: destroying everything it touches.