How Often Should I Water My Peppermint Plants?

I recently bought two peppermint plants, but they're not looking too healthy. I've read conflicting advice about how often to water them—some people say to water them less frequently, while others claim they need more water. I checked two different apps for guidance, and one suggests I might be overwatering if I water once a week, while the other advises watering every other day. Can someone help clarify the best watering routine for my peppermint plants?