Lyme disease is diagnosed clinically based on symptoms, objective physical findings (such as EM, facial palsy, or arthritis), or a history of possible exposure to infected ticks, as well as serological blood tests. The EM rash is not always a bull's eye, i.e., it can be solid red.
Rule of Thumb for Changing Filters. The rule we have followed for 18 years in the filtration industry is to change filters every 6 to 12 months. Six months is almost always optimum, especially in commercial/office settings, and twelve months is as long as you want to go no matter what.
Always keep one bottle of water in the refrigerator (or freezer if you prefer a block of ice that will thaw throughout the day). When it's time to go somewhere, swap your room temperature bottle for the cold one. Before you argue that it doesn't answer the question, remember this is LifeHacks SE not Physics SE.