Update water.md

guides/water.md

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 Water is the major component of espresso and acts as a solvent during the extraction phase. Relatively small changes in the general hardness and alkalinity of water can lead to drastic changes in the flavor profile of the resulting espresso. In addition, some municipal water sources, or even bottled water, can form scale when repeatedly heated and cooled inside your espresso machine. This can sometimes clog components, or negatively alter the flow of water in your shiny, spiffy coffee machine. To combat this, the solution is to use soft water. However, water with absolutely no mineral content has been found to negatively affect coffee extraction. Additionally, distilled water can also have a mildly corrosive affect on metal components. So, time to strike some sort of a balance. Time to explore... 
 
 ## How is the water I am using?
-Many municipal water supplies post regular water reports which can be found by googling "town name water report". The key factors to look for are general hardness (GH) and alkalinity (KH). In the United States, this is often reported as parts per million (aka mg/L of CaCO<sub>3</sub> equivalent). Electronic water TDS (total dissolved solids) meters that measure the conductance of water can also be used to get a general level of TDS in ppm, however note that these meters are not able to estimate GH or KH separtely. An electronic TDS meter is also useful for testing that DI is actually 0 TDS.
+Many municipal water supplies post regular water reports which can be found by googling "town name water report". The key factors to look for are general hardness (GH) and alkalinity (KH). In the United States, this is often reported as parts per million (aka mg/L of CaCO<sub>3</sub> equivalent). Electronic water TDS (total dissolved solids) meters that measure the conductance of water can also be used to get a general level of TDS in ppm, however note that these meters are not able to estimate GH or KH separetly. An electronic TDS meter is also useful for testing that DI is actually 0 TDS.
 
 ## ...The Simple Water Recipe