Final answer:
Kevin should consume a minimum of 3 liters of liquid to replace lost fluid.
Step-by-step explanation:
To replace lost fluid, Kevin should consume a minimum of 3 liters of liquid. This is based on the general guideline that an average adult takes in about 2500 mL (2.5 liters) of fluids per day, including both beverages and water from solid foods. Since Kevin lost 3 pounds during his workout, it is important to replace the lost fluid to maintain hydration.