The state’s top court will take up a case alleging Walgreens misused Chicago’s bottled-water tax to increase the price of products such as LaCroix and Perrier.Illinois’ Supreme Court has allowed a petition for leave to appeal in the dispute. In the litigation, the class of plaintiffs claimed the drugstore chain knowingly misapplied the city’s 5-cent tax to carbonated and flavored water drinks, items that are required to be exempt.It’s one of 13 cases the justices agreed to take up this morning …