"How to make alkaline water" Creating alkaline water at home is easy. Start with filtered water and add a squeeze of fresh lemon or lime juice. Despite being acidic, these fruits have an alkalizing effect on the body when metabolized. Another option is using alkaline water filters or ionizers, which raise the pH of tap water. However, it's important to consult with a healthcare professional before making significant changes to your water intake or pH levels, as individual needs and medical conditions can vary.