A pH measurement represents the amount of hydrogen atoms that are dissolved in a solution (this is otherwise known as acidity).
The pH scale ranges from 0 to 14; water is pH neutral which is rated as 7. Anything greater than 7 is considered basic, or alkaline, while anything less than 7 is considered acidic. For example, soap is a very alkaline substance while something like vinegar or sulfuric acid is acidic. We, as humans, have a very particular pH range needed to allow for proper chemical reactions within our system and to create an optimum environment for our bodies to function. The optimum pH is 7.3-7.4 but the majority of North Americans tend to have a more acidic environment which is an ideal environment for bacteria, viruses and fungi to proliferate.
To achieve a more alkaline environment there are many simple things you can do. Surprisingly, drinking water with a slice or two of fresh lemon actually helps to alkalize your body! Eating more alkaline foods (dark leafy greens, seaweed, sprouts and fresh herbs for example) can help lower your body's pH and help your body function optimally.